10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q/A

(Amendment No. 1)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

COMMISSION FILE NUMBER: 1-12691

ION GEOPHYSICAL CORPORATION

(EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

DELAWARE	22-2286646
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

2105 CityWest Blvd.
Suite 400
Houston, Texas	77042-2839
(Address of principal executive offices)	(Zip Code)

REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (281) 933-3339

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes:  ý    No:  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	ý	Accelerated filer	o
Non-accelerated filer	o  (Do not check if a smaller reporting company)	Smaller reporting company	o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes:  ¨    No:  ý

At July 31, 2013, there were 157,053,797 shares of common stock, par value $0.01 per share, outstanding.

1

ION GEOPHYSICAL AND SUBSIDIARIES

EXPLANATORY NOTE TO FORM 10-Q/A

This Form 10-Q/A (Amendment No. 1) amends our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2013 as filed with the Securities and Exchange Commission (the “SEC”) on August 8, 2013, and is being filed to reflect the restatement of our condensed consolidated financial statements for the six months ended June 30, 2013, as discussed in Note 1 of the Notes to Unaudited Condensed Consolidated Financial Statements contained herein.

On November 12, 2013, the Audit Committee of our Board of Directors, after considering and concurring with the recommendation of management, concluded that it was necessary to restate certain of our previously issued 2013 interim financial statements. As a result, on that date, we announced that our previously issued consolidated financial statements for the three months and six months ended June 30, 2013 should no longer be relied upon.

In connection with the preparation of our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, we determined that we had incorrectly presented the investments in our multi-client seismic data libraries, or SPANs, in our condensed consolidated statements of cash flows. We incorrectly included non-cash activity related to the investment in our multi-client seismic data libraries, which resulted in an understatement of our net cash provided by operating activities and an understatement of our net cash used in investing activities. We determined that this incorrect presentation was material to the condensed consolidated statement of cash flows for the six months ended June 30, 2013. Management concluded that the impact of the incorrect presentation to periods prior to 2013 was immaterial.

Our condensed consolidated statement of cash flows for the six months ended June 30, 2013 has been restated, resulting in an increase in our net cash flows from operating activities, with a corresponding increase in our net cash flows used in investing activities for that period. These changes within our net cash provided by operating activities and our net cash used in investing activities did not affect the total amounts of our cash and cash equivalents, nor the total amount of the net increase in cash and cash equivalents for the six months ended June 30, 2013. These changes have no effect on our condensed consolidated balance sheets, our condensed consolidated statements of income (loss), nor our condensed consolidated statements of comprehensive income (loss), as of and for the interim period ended June 30, 2013, and no effect on our business operations.

A summary of the restatement included in this amended filing is as follows (in thousands):

	Six Months Ended June 30, 2013
	As Reported			Adjustment			As Restated
Statement of Cash Flows:
Accounts payable, accrued expenses and accrued royalties	$	(26,487	)	$	15,096		$	(11,391	)
Net cash provided by operating activities	$	28,281		$	15,096		$	43,377
Investment in multi-client data library	$	(33,503	)	$	(15,096	)	$	(48,599	)
Net cash used in investing activities	$	(49,740	)	$	(15,096	)	$	(64,836	)
Net increase in cash and cash equivalents	$	48,530		$	—		$	48,530
Cash and cash equivalents at end of period	$	109,501		$	—		$	109,501

For purposes of this Form 10-Q/A, and in accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), each item in our Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2013 that was affected by this Amendment No. 1 has been amended and replaced in its entirety. As required by Rule 12b-15 under the Exchange Act, new certifications of our principal executive officer and principal financial officer are being filed as exhibits to this Form 10-Q/A under Item 6 of Part II.

This Form 10-Q/A contains modified or updated disclosures from the original Form 10-Q as required to reflect only (i) the amendments related to the restatement and (ii) the additional disclosures contained in Part I, Item 4 “Controls and Procedures.” Information with respect to events occurring after August 8, 2013 that is not required under ASC 855-10 to currently be disclosed has been or will be set forth, as appropriate, in our subsequent periodic filings, including our Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. Any reference to facts and circumstances at a “current” date refer to such facts and circumstances as of such original filing date. No attempt has been made in this Form 10-Q/A to modify or update disclosures as presented in the original Form 10-Q, except as discussed above.

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ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

TABLE OF CONTENTS FOR FORM 10-Q/A AMENDMENT TO FORM 10-Q

FOR THE QUARTER ENDED JUNE 30, 2013

	PAGE
PART I. Financial Information
Item 1. Financial Statements	4
Condensed Consolidated Balance Sheets as of June 30, 2013 and December 31, 2012	4
Condensed Consolidated Statements of Operations for the three- and six-months ended June 30, 2013 and 2012	5
Condensed Consolidated Statements of Comprehensive Income (Loss) for the three- and six-months ended June 30, 2013 and 2012	6
Condensed Consolidated Statements of Cash Flows for the six-months ended June 30, 2013 (Restated) and 2012	7
Notes to Unaudited Condensed Consolidated Financial Statements	8
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	19
Item 4. Controls and Procedures	30
PART II. Other Information
Item 6. Exhibits	32

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PART I. FINANCIAL INFORMATION

Item 1.Financial Statements

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

	June 30, 2013			December 31, 2012
	( In thousands, except share data)
ASSETS
Current assets:
Cash and cash equivalents	$	109,501		$	60,971
Accounts receivable, net	92,712			127,136
Unbilled receivables	98,944			89,784
Inventories	79,495			70,675
Prepaid expenses and other current assets	20,294			25,605
Total current assets	400,946			374,171
Deferred income tax asset	81,961			28,414
Property, plant, equipment and seismic rental equipment, net	40,001			33,772
Multi-client data library, net	227,139			230,315
Equity method investments	77,654			73,925
Goodwill	53,991			55,349
Intangible assets, net	12,992			14,841
Other assets	15,731			9,796
Total assets	$	910,415		$	820,583
LIABILITIES AND EQUITY
Current liabilities:
Current maturities of long-term debt	$	4,388		$	3,496
Accounts payable	29,996			28,688
Accrued expenses	87,600			124,095
Accrued multi-client data library royalties	24,284			26,300
Deferred revenue	18,566			26,899
Total current liabilities	164,834			209,478
Long-term debt, net of current maturities	179,319			101,832
Other long-term liabilities	132,339			8,131
Total liabilities	476,492			319,441
Redeemable noncontrolling interest	2,229			2,123
Equity:
Cumulative convertible preferred stock	27,000			27,000
Common stock, $0.01 par value; authorized 200,000,000 shares; outstanding 157,022,597 and 156,356,949 shares at June 30, 2013 and December 31, 2012, respectively, net of treasury stock	1,570			1,564
Additional paid-in capital	853,575			848,669
Accumulated deficit	(429,218		)	(360,297		)
Accumulated other comprehensive loss	(15,124		)	(11,886		)
Treasury stock, at cost, 849,539 shares at both June 30, 2013 and December 31, 2012	(6,565		)	(6,565		)
Total stockholders’ equity	431,238			498,485
Noncontrolling interests	456			534
Total equity	431,694			499,019
Total liabilities and equity	$	910,415		$	820,583

See accompanying Notes to Unaudited Condensed Consolidated Financial Statements.

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ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(In thousands, except per share data)
Service revenues	$	89,603		$	72,844		$	179,552		$	139,478
Product revenues	31,312			32,370			71,100			77,446
Total net revenues	120,915			105,214			250,652			216,924
Cost of services	66,965			43,321			136,238			90,727
Cost of products	17,332			15,950			42,839			39,098
Gross profit	36,618			45,943			71,575			87,099
Operating expenses:
Research, development and engineering	9,087			10,306			18,377			18,032
Marketing and sales	8,968			8,654			16,948			16,071
General, administrative and other operating expenses	11,793			14,011			27,557			28,381
Total operating expenses	29,848			32,971			62,882			62,484
Income from operations	6,770			12,972			8,693			24,615
Interest expense, net	(2,756		)	(1,364		)	(3,822		)	(2,882		)
Equity in earnings (losses) of investments	(6,338		)	3,777			(5,222		)	6,245
Other income (expense), net	(107,118		)	895			(106,091		)	209
Income (loss) before income taxes	(109,442		)	16,280			(106,442		)	28,187
Income tax expense (benefit)	(38,705		)	4,184			(37,504		)	7,629
Net income (loss)	(70,737		)	12,096			(68,938		)	20,558
Net income (loss) attributable to noncontrolling interest	(59		)	281			17			394
Net income (loss) attributable to ION	(70,796		)	12,377			(68,921		)	20,952
Preferred stock dividends	338			338			676			676
Net income (loss) applicable to common shares	$	(71,134	)	$	12,039		$	(69,597	)	$	20,276
Net income (loss) per share:
Basic	$	(0.45	)	$	0.08		$	(0.44	)	$	0.13
Diluted	$	(0.45	)	$	0.08		$	(0.44	)	$	0.13
Weighted average number of common shares outstanding:
Basic	156,910			155,631			156,689			155,587
Diluted	156,910			162,575			156,689			162,594

See accompanying Notes to Unaudited Condensed Consolidated Financial Statements.

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ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(UNAUDITED)

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(In thousands)
Net income (loss)	$	(70,737	)	$	12,096		$	(68,938	)	$	20,558
Other comprehensive income (loss), net of taxes, as appropriate:
Foreign currency translation adjustments	597			(1,503		)	(3,044		)	265
Equity interest in investees' other comprehensive income (loss)	(526		)	369			(549		)	716
Unrealized income (loss) on available-for-sale securities	245			(499		)	177			463
Other changes in other comprehensive income (loss)	102			(34		)	178			(27		)
Total other comprehensive income (loss), net of taxes	418			(1,667		)	(3,238		)	1,417
Comprehensive net income (loss)	(70,319		)	10,429			(72,176		)	21,975
Comprehensive income (loss) attributable to noncontrolling interest	(59		)	281			17			394
Comprehensive net income (loss) attributable to ION	$	(70,378	)	$	10,710		$	(72,159	)	$	22,369

See accompanying Notes to Unaudited Condensed Consolidated Financial Statements.

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ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Six Months Ended June 30,
	2013			2012
	Restated (Note 1)
	(In thousands)
Cash flows from operating activities:
Net income (loss)	$	(68,938	)	$	20,558
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization (other than multi-client data library)	8,302			6,825
Amortization of multi-client data library	36,679			38,918
Stock-based compensation expense	3,831			2,992
Equity in (earnings) losses of investments	5,222			(6,245		)
Gain on sale of cost-method investment	(3,591		)	—
Accrual for loss contingency related to legal proceedings	110,000			—
Deferred income taxes	(48,627		)	(2,225		)
Change in operating assets and liabilities:
Accounts receivable	34,259			61,701
Unbilled receivables	(9,160		)	(32,300		)
Inventories	(8,993		)	(5,447		)
Accounts payable, accrued expenses and accrued royalties	(11,391		)	9,041
Deferred revenue	(8,242		)	(6,176		)
Other assets and liabilities	4,026			(1,912		)
Net cash provided by operating activities	43,377			85,730
Cash flows from investing activities:
Investment in multi-client data library	(48,599		)	(52,581		)
Purchase of property, plant and equipment	(8,963		)	(4,890		)
Investment in seismic rental equipment	—			(1,384		)
Investment in and advances to GeoRXT	(9,500		)	—
Proceeds from sale of investment	4,150			—
Maturity of short-term investments	—			20,000
Investment in convertible note	(2,000		)	(1,000		)
Other investing activities	76			—
Net cash used in investing activities	(64,836		)	(39,855		)
Cash flows from financing activities:
Proceeds from issuance of notes	175,000			—
Payments under amended revolving line of credit	(97,250		)	(1,000		)
Borrowings under amended revolving line of credit	—			98,250
Repayment of term loan	—			(98,250		)
Payments on long-term debt	(1,815		)	(2,081		)
Cost associated with issuance of notes	(6,731		)	—
Cost associated with debt amendment	—			(1,313		)
Payment of preferred dividends	(676		)	(676		)
Proceeds from exercise of stock options	1,972			317
Other financing activities	302			(101		)
Net cash provided by (used in) financing activities	70,802			(4,854		)
Effect of change in foreign currency exchange rates on cash and cash equivalents	(813		)	(141		)
Net increase in cash and cash equivalents	48,530			40,880
Cash and cash equivalents at beginning of period	60,971			42,402
Cash and cash equivalents at end of period	$	109,501		$	83,282

See accompanying Notes to Unaudited Condensed Consolidated Financial Statements.

7

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(1)    Basis of Presentation and Restatement

Basis of Presentation

The condensed consolidated balance sheet of ION Geophysical Corporation and its subsidiaries (collectively referred to as the “Company” or “ION,” unless the context otherwise requires) at December 31, 2012 has been derived from the Company’s audited consolidated financial statements at that date. The condensed consolidated balance sheet at June 30, 2013, and the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2013 and 2012 and the condensed consolidated statements of cash flows for the six months ended June 30, 2013 and 2012, are unaudited. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The results of operations for the three and six months ended June 30, 2013 are not necessarily indicative of the operating results for a full year or of future operations.

These condensed consolidated financial statements have been prepared using accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and applicable rules of Regulation S-X of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in annual financial statements presented in accordance with accounting principles generally accepted in the United States have been omitted. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 and Amendment No. 1 thereto on Form 10-K/A, which was filed on April 17, 2013 and contains the separate consolidated financial statements of INOVA Geophysical Equipment Limited (“INOVA Geophysical”) for the fiscal year ended December 31, 2012.

Restatement of the Financial Statements for the Three and Six Months Ended June 30, 2013

The condensed consolidated statement of cash flows for the six months ended June 30, 2013 has been restated. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, the Company determined that it had incorrectly presented certain non-cash investments in its multi-client seismic data libraries in its condensed consolidated statements of cash flows. The Company incorrectly included non-cash activity related to the investment in its multi-client seismic data libraries, which resulted in an understatement of its cash provided by operating activities and an understatement of its cash used in investing activities. Management concluded that the impact of the incorrect presentation to periods prior to 2013 was immaterial.

The consolidated financial information contained in this Form 10-Q/A for the six months ended June 30, 2013 reflects the Company’s restated statement of cash flows for this six-month period resulting in changes within cash flows from operating and investing activities, but no change to total cash and cash equivalents. The adjustments reflected in the restatement of the condensed consolidated statement of cash flows are as follows (in thousands):

	Six Months Ended June 30, 2013
	As Reported			Adjustment			As Restated
Statement of Cash Flows:
Accounts payable, accrued expenses and accrued royalties	$	(26,487	)	$	15,096		$	(11,391	)
Net cash provided by operating activities	$	28,281		$	15,096		$	43,377
Investment in multi-client data library	$	(33,503	)	$	(15,096	)	$	(48,599	)
Net cash used in investing activities	$	(49,740	)	$	(15,096	)	$	(64,836	)
Net increase in cash and cash equivalents	$	48,530		$	—		$	48,530
Cash and cash equivalents at end of period	$	109,501		$	—		$	109,501

(2)Segment Information

The Company operates through three business segments – Solutions, Systems and Software. In addition, the Company has a 49% ownership interest in its INOVA Geophysical joint venture. The Company measures segment operating results based on income from operations. See Note 3 “Equity Method Investments” for the summarized financial information for INOVA Geophysical.

A summary of segment information is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net revenues:
Solutions:
New Venture	$	33,249	$	21,544	$	81,685	$	50,538
Data Library	21,521		22,235		30,969		32,503
Total multi-client revenues	54,770		43,779		112,654		83,041
Data Processing	33,849		28,190		65,135		55,055
Total	$	88,619	$	71,969	$	177,789	$	138,096
Systems:
Towed Streamer	$	12,570	$	13,727	$	26,119	$	29,531
Ocean Bottom	383		1,616		7,148		5,135
Other	10,895		7,476		22,428		24,859
Total	$	23,848	$	22,819	$	55,695	$	59,525
Software:
Software Systems	$	7,464	$	9,551	$	15,405	$	17,921
Services	984		875		1,763		1,382
Total	$	8,448	$	10,426	$	17,168	$	19,303
Total	$	120,915	$	105,214	$	250,652	$	216,924
Gross profit:
Solutions	$	21,890	$	28,904	$	42,087	$	47,889
Systems	8,802		9,234		17,182		25,046
Software	5,926		7,805		12,306		14,164
Total	$	36,618	$	45,943	$	71,575	$	87,099

8

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Gross margin:
Solutions	25		%	40		%	24		%	35		%
Systems	37		%	40		%	31		%	42		%
Software	70		%	75		%	72		%	73		%
Total	30		%	44		%	29		%	40		%
Income from operations:
Solutions	$	11,021		$	17,434		$	18,378		$	27,040
Systems	1,504			995			2,438			9,735
Software	4,955			6,879			10,116			12,361
Corporate and other	(10,710		)	(12,336		)	(22,239		)	(24,521		)
Income from operations	6,770			12,972			8,693			24,615
Interest expense, net	(2,756		)	(1,364		)	(3,822		)	(2,882		)
Equity in earnings (losses) of investments	(6,338		)	3,777			(5,222		)	6,245
Other income (expense), net	(107,118		)	895			(106,091		)	209
Income (loss) before income taxes	$	(109,442	)	$	16,280		$	(106,442	)	$	28,187

(3)Equity Method Investments

The following table reflects the change in the Company’s equity method investments and note receivable from equity method investees during the six months ended June 30, 2013 (in thousands):

	INOVA Geophysical			GeoRXT			Total
Investment at December 31, 2012	$	73,925		$	—		$	73,925
Investment in equity	—			1,500			1,500
Note receivable	—			8,000			8,000
Equity in losses of investments	(2,876		)	(2,346		)	(5,222		)
Equity interest in investees' other comprehensive income (loss)	(549		)	—			(549		)
Investments at June 30, 2013	$	70,500		$	7,154		$	77,654

GeoRXT — In late February 2013, the Company purchased from Reservoir Exploration Technology ASA its 30% interest in a joint venture entity, GeoRXT B.V. (“GeoRXT”), for $1.5 million. GeoRXT is headquartered in Rio de Janeiro, Brazil, and specializes in seismic acquisition operations using ocean-bottom cables deployed from vessels leased by GeoRXT. The Company was granted an option, exercisable at any time on or prior to May 15, 2013, to increase its ownership percentage to 50%, which would have required making additional capital contributions to GeoRXT of $40.0 million. Additionally, the Company provided GeoRXT with an $8.0 million working capital loan, the repayment of which is guaranteed by the Company’s majority joint venture partner in GeoRXT, Georadar Levantamentos Geofisicos S/A (“Georadar”). The stated maturity date of the loan was May 25, 2013. The Company continues to perform a due diligence review of GeoRXT and has not yet increased its ownership interest in GeoRXT to a 50% equity interest. If the Company increases its ownership interest, a portion of the Company’s required capital contribution to GeoRXT for the additional equity interest would likely be effectively funded through the conversion of the loan into equity. As a result, the Company has elected to allow this loan to remain outstanding until the Company decides whether to increase its ownership interest.

9

The Company accounts for its interest in GeoRXT on a current basis; its shares of losses in GeoRXT for the three months and six months ended June 30, 2013 were $1.6 million and $2.3 million, respectively. The Company’s share of losses for the three months ended June 30, 2013 would have effectively reduced its equity method investment in GeoRXT to less than zero. Therefore, the Company reduced its equity method investment to zero and recorded its share of additional losses, totaling $0.8 million, to reduce the carrying value of the note receivable from GeoRXT. The following table reflects the summarized financial information for GeoRXT for the three months ended June 30, 2013 and the period from March 1 to June 30, 2013 (in thousands):

	Three Months Ended June 30, 2013			Period from March 1 to June 30, 2013
Net revenues	$	13,698		$	19,668
Gross profit	$	(195	)	$	122
Loss from operations	$	(5,107	)	$	(6,876	)
Net loss	$	(5,151	)	$	(7,045	)

INOVA Geophysical — The Company accounts for its 49% interest in INOVA Geophysical as an equity method investment and records its share of earnings and losses of INOVA Geophysical on a one fiscal quarter lag basis. For the three and six months ended June 30, 2013, the Company recorded its share of losses from INOVA Geophysical of $(4.7) million and $(2.9) million, respectively, compared to equity earnings in the same periods one year ago of $3.8 million and $6.2 million, respectively. The following table reflects the summarized financial information for INOVA Geophysical for the three months ended March 31, 2013 and 2012 and the six-month periods from October 1 to March 31 of 2013 and 2012 (in thousands):

	Three months ended March 31,					Six-Month Period from October 1 through March 31
	2013			2012		2013			2012
Net revenues	$	22,095		$	56,779	$	81,706		$	115,777
Gross profit	$	1,808		$	19,502	$	14,135		$	33,466
Income (loss) from operations	$	(8,511	)	$	8,910	$	(8,761	)	$	15,419
Net income (loss)	$	(9,772	)	$	8,654	$	(6,030	)	$	14,371

(4)Net Income (Loss) per Share

Basic net income (loss) per common share is computed by dividing net income (loss) applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is determined based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issued or reserved for future issuance under outstanding stock options at June 30, 2013 and 2012 was 7,313,250 and 6,745,354, respectively, and the total number of shares of restricted stock and shares reserved for restricted stock units outstanding at June 30, 2013 and 2012 was 989,354 and 837,104, respectively.

As of June 30, 2013, there are 27,000 outstanding shares of the Company’s Series D Cumulative Convertible Preferred Stock (“Series D Preferred Stock”), which may currently be converted, at the holder’s election, into up to 6,065,075 shares of the Company’s common stock. The effects of the dilutive stock awards and the outstanding shares of Series D Preferred Stock were anti-dilutive for three and six months ended June 30, 2013.

The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Net income (loss) applicable to common shares	$	(71,134	)	$	12,039	$	(69,597	)	$	20,276
Income impact of assumed Series D Preferred Stock conversion	—			338		—			676
Net income (loss) after assumed Series D Preferred Stock conversion	$	(71,134	)	$	12,377	$	(69,597	)	$	20,952
Weighted average number of common shares outstanding	156,910			155,631		156,689			155,587
Effect of dilutive stock awards	—			879		—			942
Effect of convertible preferred stock	—			6,065		—			6,065
Weighted average number of diluted common shares outstanding	156,910			162,575		156,689			162,594
Basic net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13
Diluted net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13

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(5)Long-term Debt

Obligations (in thousands)	June 30, 2013			December 31, 2012
Senior secured second-priority notes	$	175,000		$	—
Revolving line of credit	—			97,250
Facility lease obligation	1,936			2,334
Equipment capital leases	6,771			5,744
Total	183,707			105,328
Current portion of long-term debt and lease obligations	(4,388		)	(3,496		)
Non-current portion of long-term debt and lease obligations	$	179,319		$	101,832

Senior Secured Second-Priority Notes

On May 13, 2013, the Company sold $175 million aggregate principal amount of 8.125% Senior Secured Second-Priority Notes due 2018 (“Notes”) in a private offering pursuant to an Indenture dated as of May 13, 2013.  The Notes are senior secured second-priority obligations of the Company, are guaranteed by certain of the Company’s U.S. subsidiaries, and mature on May 15, 2018.  Interest on the Notes accrues at the rate of 8.125% per annum and will be payable semiannually in arrears on May 15 and November 15, commencing on November 15, 2013.

On or after May 15, 2015, the Company may on one or more occasions redeem all or a part of the Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Notes redeemed during the twelve-month period beginning on May 15th of the years indicated below:

Date	Percentage
2015	104.063	%
2016	102.031	%
2017 and thereafter	100.000	%

The Notes are initially jointly and severally guaranteed on a senior secured basis by each of the Company’s current material U.S. subsidiaries: GX Technology Corporation, ION Exploration Production (U.S.A.), Inc. and I/O Marine Systems, Inc. (the “Notes Guarantors”). The Notes and the guarantees are secured, subject to certain exceptions and permitted liens, by second-priority liens on substantially all of the assets that secure the indebtedness under the Company's senior first-priority secured credit facility with China Merchants Bank Co., Ltd., New York Branch (“CMB”) as administrative agent and lender under the facility (see “- Revolving Line of Credit” below). The indebtedness under the Notes is effectively junior to the Company's obligations under the senior secured credit facility to the extent of the value of the collateral securing the facility, and to any other indebtedness secured on a first-priority basis to the extent of the value of the Company's assets subject to those first-priority security interests.

The Company used the net proceeds from the offering to repay outstanding indebtedness under its senior secured credit facility with CMB and for general corporate purposes, including for potential additional capital contributions to GeoRXT. The Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or applicable state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws.

The Notes contain certain covenants that, among other things, limit the Company’s ability and the ability of its restricted subsidiaries to:

• Make certain investments; pay certain dividends or distributions on the capital stock or other equity interests of the Company or any restricted subsidiary; purchase, redeem or retire capital stock or certain indebtedness or make other types of restricted payments, unless

• No default under the Indenture has occurred or would occur as a result of such payment or investment,

• The Company would, after giving pro forma effect to such investment or payment, have been permitted to incur at least $1.00 of additional indebtedness under a Fixed Charge Coverage Ratio test under the Indenture and

• The aggregate cumulative amount of all such payments or investments would not exceed a sum calculated by reference to, among other items, the Company's consolidated net income, proceeds from certain sales of equity or assets, certain conversions or exchanges of debt for equity and certain other reductions in indebtedness;

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• Incur additional indebtedness or issue certain preferred stock, unless the Fixed Charge Coverage Ratio for the four most recently completed fiscal quarters immediately prior to such incurrence or issuance would have been 2.0 to 1.0, as determined on a pro forma basis as if the debt had been incurred or the stock issued at the beginning of such four-quarter period;

• Create, incur or assume any lien, except certain permitted liens;

• Restrict or encumber the ability of any restricted subsidiary to (i) pay dividends on or make any other distributions with respect to its equity interests, (ii) pay indebtedness owed to the Company or any restricted subsidiary, (iii) make loans or advances to the Company or any of its restricted subsidiaries or (iv) sell, lease or transfer properties or assets to the Company or any restricted subsidiary;

• Carry out certain mergers or consolidations with another entity, or sell, assign or lease all or substantially all of the properties or assets of the Company and its Restricted Subsidiaries, taken as a whole, unless

• No default under the Indenture has occurred or would occur as a result of such merger or sale, and

• The Fixed Charge Coverage Ratio of the Company or its successor for the four most recently completed fiscal quarters immediately prior to such merger or sale would have been 2.0 to 1.0, as determined on a pro forma basis as if the merger or sale and any related financing transactions had occurred at the beginning of such four-quarter period, which would permit the Company or its successor to incur additional indebtedness under the Indenture;

• Create unrestricted subsidiaries; or

• Enter into certain transactions with affiliates of the Company.

These and other restrictive covenants contained in the Indenture are subject to important exceptions and qualifications.All of the Company's subsidiaries are currently restricted subsidiaries.

As of June 30, 2013, the Company was in compliance with these covenants.

In connection with the offering of the Notes, the Company entered into a consent agreement with CMB as administrative agent and lender under the Company’s senior secured credit facility. See “— Revolving Line of Credit” below.

In connection with the issuance of the Notes, the Company and the Notes Guarantors entered into a second lien intercreditor agreement dated as of May 13, 2013 (the “Intercreditor Agreement”) with, among others, CMB, as administrative agent, first lien representative for the first lien secured parties and collateral agent for the first lien secured parties, the trustee under the Indenture and the collateral agent for the second lien secured parties. The Intercreditor Agreement provides, among other things, that the liens on the collateral securing the Notes and related obligations will be junior and subordinate in all respects to the liens on the collateral securing the Company's senior secured credit facility and related obligations.

Revolving Line of Credit

On May 29, 2012, the Company amended the terms of its senior secured credit facility (the “Credit Facility”) with CMB, as administrative agent and lender. The First Amendment to the Credit Agreement and Loan Documents (the “First Amendment”) modified certain provisions of the Company’s senior credit agreement with CMB that it had entered into on March 25, 2010. The maturity date of any outstanding debt under the Credit Facility remains March 24, 2015.

As amended by the First Amendment, the Credit Facility provides that the Company may make revolving credit borrowings in U.S. Dollars, Euros, British Pounds Sterling or Canadian Dollars up to an amount not to exceed the U.S. Dollar equivalent of $175.0 million. The Company also agreed that no additional borrowings may be made at any time at which the outstanding indebtedness under the revolving line of credit (principal, accrued interest and fees) exceeds the U.S. Dollar equivalent of $175.0 million. The First Amendment eliminated sub-facility limits under the Credit Facility.

The Company’s obligations under the Credit Facility continue to be guaranteed by certain of its material U.S. subsidiaries that remain as parties to the Credit Facility. In addition, INOVA Geophysical continues to provide a bank stand-by letter of credit as credit support for the Company’s obligations under the Credit Facility. The Company also entered into a credit support agreement with INOVA Geophysical whereby the Company has agreed to indemnify INOVA Geophysical for any and all losses sustained by INOVA Geophysical that arise out of INOVA Geophysical’s guarantee.

As amended by the First Amendment, the interest rates per annum on borrowings under the Credit Facility are, at the Company’s option:

• an alternate base rate equal to the sum of (i) the greatest of (a) the prime rate of CMB, (b) a federal funds effective rate plus 0.50%, or (c) an adjusted LIBOR-based rate plus 1.0%, and (ii) an applicable interest margin of 1.4% (reduced from 2.5%); or

• for eurodollar borrowings and borrowings in Euros, Pounds Sterling or Canadian Dollars, the sum of (i) an adjusted LIBOR-based rate, and (ii) an applicable interest margin of 2.4% (reduced from 3.5%).

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As of June 30, 2013, no borrowed amounts were outstanding under the Credit Facility.

The Credit Facility contains covenants that restrict the Company, subject to certain exceptions, from:

• incurring additional indebtedness (including certain capital lease obligations), granting or incurring additional liens on the Company's properties, pledging shares of the Company's subsidiaries, entering into certain merger or other change-in-control transactions, entering into certain transactions with the Company's affiliates, making certain sales or other dispositions of assets, making certain investments, acquiring other businesses and entering into sale-leaseback transactions with respect to the Company's properties;

• paying cash dividends on the Company's common stock; and     

• repurchasing and acquiring the Company's capital stock, unless there is no event of default under the Credit Facility and the amount of such repurchases does not exceed an amount equal to (i) 25% of the Company's consolidated net income for the prior fiscal year, less (ii) the amount of any cash dividends paid on the Company's common stock.

The Credit Facility requires compliance with certain financial covenants, including the following:

• maintain a minimum fixed charge coverage ratio, as defined, in an amount equal to at least 1.125 to 1;

• not exceed a maximum leverage ratio, as defined, of 3.25 to 1; and

• maintain a minimum tangible net worth of at least 60% of the Company’s tangible net worth as of March 31, 2010, as defined.

The fixed charge coverage ratio is defined as the ratio of (i) the Company's consolidated EBITDA, as defined in the Credit Facility, less cash income tax expense, non-financed capital expenditures and capitalized research and development costs to (ii) the sum of scheduled payments of lease payments and payments of principal indebtedness, interest expense actually paid and cash dividends, in each case for the four consecutive fiscal quarters most recently ended. The leverage ratio is defined as the ratio of (x) total funded consolidated debt, capital lease obligations and issued letters of credit (net of cash collateral) to (y) the Company's consolidated EBITDA for the four consecutive fiscal quarters most recently ended.

The Credit Facility contains customary event of default provisions, including a “change of control” event, the occurrence of which could lead to an acceleration of the Company's obligations under the Credit Facility. The Credit Facility also provides that certain acts of bankruptcy, insolvency or liquidation of INOVA Geophysical or BGP, Inc., China National Petroleum Corporation (“BGP”) would constitute additional events of default under the Credit Facility.

As of June 30, 2013, the Company was in compliance with these financial covenants and the Company expects to remain in compliance with these financial covenants for at least the next 12 months.

In connection with the Company’s offering of the Notes, on April 12, 2013, the Company, the Notes Guarantors and CMB, as administrative agent and lender under the Credit Facility, entered into a consent agreement related to the Credit Facility that permitted the Company and the Notes Guarantors to, among other things, (i) issue the Notes and related guarantees and (ii) invest a cumulative aggregate amount of up to $100 million in GeoRXT from and after February 26, 2013.

(6)Income Taxes

The Company maintains a valuation allowance for a portion of its deferred tax assets, which relate to U.S. capital losses or basis differences that will create capital losses as well as non-U.S. net operating losses. The valuation allowance is calculated in accordance with the provisions of Accounting Series Codification (“ASC”) 740 “Income Taxes,” which requires that a valuation allowance be established or maintained when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. In the event the Company's expectations of future operating results change, the valuation allowance may need to be adjusted upward or downward. As of June 30, 2013, the Company's unreserved U.S. net deferred tax assets totaled $55.8 million, including $42.0 million of deferred tax assets related to the impact of an accrual with respect to certain outstanding litigation, recorded primarily in the three months ended June 30, 2013. See Note 8 “Litigation — WesternGeco” below. These existing unreserved net deferred tax assets are currently considered to be “more likely than not” realized based on the Company’s expectations of future earnings and available tax planning strategies.

The Company's effective tax rates for the three months ended June 30, 2013 and 2012 were 35.4% and 25.7%, respectively, and for the six months ended June 30, 2013 and 2012 were 35.2% and 27.1%, respectively. The change in the Company's effective tax rate was due primarily to the tax impact of the accrual for litigation recognized during the three months ended June 30, 2013.

The total amount of the Company’s unrecognized tax benefits as of June 30, 2013 was $2.0 million. The Company accrues estimated interest and penalties, if any, related to unrecognized tax benefits as a component of the Company’s provision for income taxes.

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The Company’s U.S. federal tax returns for 2007 and subsequent years remain subject to examination by tax authorities. The Company is no longer subject to IRS examination for periods prior to 2007, although carryforward attributes that were generated prior to 2007 may still be adjusted upon examination by the IRS if they either have been or will be used in an open year. In the Company’s foreign tax jurisdictions, tax returns for 2008 and subsequent years generally remain open to examination.

(7)Fair Value of Financial Instruments

The Company’s financial instruments include cash and cash equivalents, accounts and unbilled receivables, notes receivable, accounts payable, accrued multi-client data library royalties, investment in a convertible note from a privately-owned U.S.-based technology company and long-term debt. The carrying amounts of cash and cash equivalents, accounts and unbilled receivables, notes receivable, accounts payable and accrued multi-client data library royalties approximate fair value due to the highly liquid nature of these instruments.

The carrying amounts of the Company’s long-term debt as of June 30, 2013 and December 31, 2012 were $183.7 million and $105.3 million, respectively, compared to its fair values of $173.2 million and $105.3 million as of June 30, 2013 and December 31, 2012, respectively. The fair value of the long-term debt was calculated using a market approach based upon Level 2 inputs, including a price quote from a major financial institution, as of June 30, 2013. As of December 31, 2012, Level 3 inputs were used, including an estimated interest rate reflecting then-current market conditions.

The following table provides additional information related to assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012. The reference to level within the table relates to the level of inputs used to determine fair value, which the key inputs are then described below. The table is as follows (amounts in thousands):

	Level 1		Level 2		Level 3
As of June 30, 2013:
Investment in convertible note	$	—	$	—	$	3,972
As of December 31, 2012:
Investment in convertible notes	—		—		8,195

Investment in Convertible Notes. In May 2011, the Company purchased a convertible note from a privately-owned U.S.-based technology company. The original principal amount of the note is $6.5 million, and it bears interest at a rate of 4% per annum. On April 25, 2013, the Company converted the note and accrued interest into 1,533,858 common shares of the investee which resulted in a post-conversion equity ownership percentage interest in the investee of 16%. At April 25, 2013, prior to conversion, the note and accrued interest had a fair value of $6.9 million compared to a book value of $7.0 million resulting in a realized loss of $(0.1) million. The Company performed a fair value analysis with respect to its investment in the convertible note and interest using Level 3 inputs. These inputs included an income approach, using a discounted cash flow model; a market approach, using peer company multiples; as well as a market approach, including terms and likelihood of an investment event.

In March 2012, the Company and the investee entered into an agreement for the Company to make available to the investee a credit facility in an amount of up to $4.0 million. This credit facility originally had a term of one year with an option to extend its term by one year, which was agreed to by the Company and the investee effective March 16, 2013. The credit facility indebtedness now matures on March 15, 2014. The credit facility allows for conversion of the outstanding balance of the promissory note under the credit facility into common shares of the investee. As of June 30, 2013, the investee had drawn $4.0 million under this credit arrangement.

The Company performed a fair value analysis with respect to its investment in the convertible note using Level 3 inputs. These inputs included an income approach, using a discounted cash flow model; a market approach, using peer company multiples; as well as a market approach, including the terms and likelihood of an investment event. As of June 30, 2013, the fair value of this investment was approximately $4.0 million; which was equal to its carrying value.

(8)Litigation

WesternGeco

In June 2009, WesternGeco L.L.C. (“WesternGeco”) filed a lawsuit against the Company in the United States District Court for the Southern District of Texas, Houston Division. In the lawsuit, styled WesternGeco L.L.C. v. ION Geophysical Corporation, WesternGeco alleged that the Company had infringed several method and apparatus claims contained in four of its United States patents regarding marine seismic streamer steering devices. WesternGeco sought unspecified monetary damages and an injunction prohibiting the Company from making, using, selling, offering for sale or supplying any infringing products in the United States.

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In June 2010, WesternGeco filed a lawsuit against various subsidiaries and affiliates of Fugro N.V. (“Fugro”), one of the Company’s seismic contractor customers, accusing Fugro of infringing the same United States patents regarding marine seismic streamer steering devices by planning to use certain equipment purchased from the Company on a survey located outside of U.S. territorial waters. The court approved the consolidation of the Fugro case with the case against the Company. Fugro filed a motion to dismiss the lawsuit, and in March 2011 the presiding judge granted Fugro’s motion to dismiss in part, on the basis that the alleged activities of Fugro would occur more than 12 miles from the U.S. coast and therefore are not actionable under U.S. patent infringement law. In response to a Motion for Summary Judgment filed jointly by the Company and Fugro, the Court ruled in April 2012 that the Company did not directly infringe WesternGeco’s method patent claims. In a pre-trial ruling on June 29, 2012, the Court ruled that, if a particular patent claim of WesternGeco was held to be valid and enforceable at the trial, the Company’s supplying of its DigiFIN^® lateral streamer control units and related software from the United States to its customers overseas with an intention for the customers to combine DigiFIN and such related software with other required components of the patent claim, would infringe one claim in one of WesternGeco’s asserted patents, U.S. Patent No. 7,293,520.

Trial began on July 23, 2012. During the trial, Fugro settled all claims asserted against it by WesternGeco and obtained a global license from WesternGeco. A verdict was returned by the jury on August 16, 2012, finding that the Company willfully infringed the claims contained in the four patents by supplying DigiFIN and the related software from the United States and awarded WesternGeco the sum of $105.9 million in damages, consisting of $12.5 million in reasonable royalty and $93.4 million in lost profits.

In September 2012, the Company filed motions with the trial court to overturn all or portions of the verdict. In June 2013, the presiding judge entered a Memorandum and Order rejecting the jury's finding of willfulness and denying WesternGeco's motions for willfulness and enhanced damages, but also denying the Company's post-verdict motions that challenged the jury's infringement findings and the damages amount. In the Memorandum and Order, the judge also stated that he would approve WesternGeco’s motion for a permanent injunction and that WesternGeco is entitled to be awarded damages for the additional DigiFIN units that were sold to customers prior to the entry of the final judgment but that were not included in the jury verdict due to the timing of the trial. The Court will likely determine supplemental damages for the additional sold DigiFIN units in a future order or a future proceeding.

The next probable step in the case is for the trial court judge to sign and enter a final judgment. As of the filing date of this Quarterly Report on Form 10-Q, the Court had not yet entered a final judgment in the case.

Upon the entering of a final judgment, the Company intends to appeal the judgment to the United States Court of Appeals for the Federal Circuit. WesternGeco would also have the right to elect to appeal any final judgment.

Either within its final judgment or in a separate order entered after its final judgment, the trial court has ruled that it will also enter a permanent injunction against the Company. As of the filing date of this Quarterly Report on Form 10-Q, the Court had not issued the terms of the permanent injunction. Until the permanent injunction is entered, the terms of the injunction cannot be known for certain, but it is likely that the permanent injunction will prohibit the Company from supplying its DigiFIN units and related software from the United States to its customers overseas with an intention for the customers to combine DigiFIN and the software with other required components of the patent claims. The Company has reorganized its operations such that it no longer supplies DigiFIN units and the related software from the United States.

Based on the Company’s analysis after the trial court’s Memorandum and Order in June 2013 denying the Company’s post-verdict motions that challenged the jury's infringement findings and the damages amount, the Company determined to increase its loss contingency accrual related to this case from $10.0 million to $120.0 million, consisting of jury verdict damages, court costs, and estimates of prejudgment interest and supplemental damages.

The Company’s assessment of its potential loss contingency may change in the future due to developments at the trial court or appellate court and other events, such as changes in applicable law, and such reassessment could lead to the determination that no loss contingency is probable or that a greater loss contingency is probable, which could have a material effect on the Company’s financial condition or results of operations.

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As stated above, the Company intends to appeal the trial court judgment to the United States Court of Appeals for the Federal Circuit. In order to appeal the judgment, the Company may be required to post an appeal bond for the full amount of damages entered in the judgment. To be prepared for a possible adverse judgment in this case, the Company has arranged with sureties to post an appeal bond on its behalf if necessary. Although the terms of the appeal bond enable each surety to require the Company to post collateral with the surety at any time the bond is outstanding, for up to the full amount of the bond, each surety has represented to the Company that such a requirement would only occur in rare circumstances where the surety deems a larger amount of security is necessary. In the unlikely event that the Company is required to post collateral with a surety during the appeal process, depending on the size of the bond and the level of required collateral, in order to collateralize the bond the Company might need to utilize a combination of cash on hand, undrawn balances available under its revolving line of credit and possibly incur additional debt and/or equity financing. The collateralization of such a large appeal bond could have a possible adverse effect on the Company’s liquidity. If the Company is unable to post the appeal bond, the Company may be unable to stay enforcement of the judgment or appeal the case. At this time, the Company is unable to determine the amount of such an appeal bond or whether and to what extent the sureties may require the appeal bond to be collateralized in the future. Similarly, the Company is unable to predict the timing of the final judgment being entered by the trial court or the timing of posting any required appeal bond.

Fletcher

In November 2009, Fletcher International Ltd. (“Fletcher”), the holder of the shares of the Company’s outstanding Series D Preferred Stock until June 2012, filed a lawsuit against the Company and certain of its directors in the Delaware Court of Chancery. In the lawsuit, styled Fletcher International, Ltd. v. ION Geophysical Corporation, et al, Fletcher alleged, among other things, that the Company violated Fletcher’s consent rights contained in the Series D Preferred Stock Certificates of Designation, by (a) the execution and delivery of a convertible promissory note to the Bank of China, New York Branch by one of the Company’s subsidiaries (incorporated in Luxembourg), in connection with a bridge loan funded in October 2009 by Bank of China, and (b) a Canadian subsidiary of the Company executing and delivering several promissory notes in 2008 in connection with the Company’s acquisition of ARAM Systems Ltd., Fletcher also alleged that the Company’s directors violated their fiduciary duties by allowing the subsidiaries to deliver the notes without Fletcher’s consent. In a Memorandum Opinion issued in May 2010 in response to a motion for partial summary judgment, the judge dismissed all of Fletcher’s claims against the named Company directors but also concluded that, because the bridge loan note executed by the Company’s Luxembourg subsidiary in 2009 was convertible into the Company’s common stock, Fletcher had the right to consent to the issuance of the note and that the Company had violated Fletcher’s consent rights by that subsidiary’s issuing the note without Fletcher’s consent. In March 2011, the judge dismissed certain additional claims asserted by Fletcher. In May 2012, the judge ruled that Fletcher did not have the right to consent with respect to two promissory notes executed and delivered by the Canadian subsidiary in September 2008 in connection with the Company’s purchase of ARAM Systems Ltd., but that Fletcher did have the right to consent to the execution and delivery in December 2008 of a replacement promissory note in the principal amount of $35 million, and that the Company had violated Fletcher’s consent rights by the subsidiary’s executing and delivering the replacement promissory note without Fletcher’s consent. Fletcher has since declared to the Court that it will not pursue damages related to the issuance of the replacement $35 million promissory note.

In June 2012, Fletcher filed a voluntary petition for relief under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the Southern District of New York. Fletcher’s shares of Series D Preferred Stock, which had been pledged by Fletcher to secure certain indebtedness, were sold by the pledgee to the affiliate of D.E. Shaw & Co., Inc. in June 2012. The Company does not believe that the acquisition of the shares by such D. E. Shaw & Co., Inc. affiliate or the bankruptcy filing by Fletcher will have a material impact on Fletcher’s lawsuit against the Company. The Company believes that the monetary damages suffered by Fletcher as a result of the Company’s subsidiary executing and delivering the convertible note without Fletcher’s consent are nonexistent or nominal, and that the ultimate outcome of the lawsuit will not result in a material adverse effect on the Company’s financial condition or results of operations.

Other

The Company has been named in various other lawsuits or threatened actions that are incidental to its ordinary business. Litigation is inherently unpredictable. Any claims against the Company, whether meritorious or not, could be time-consuming, cause the Company to incur costs and expenses, require significant amounts of management time and result in the diversion of significant operational resources. The results of these lawsuits and actions cannot be predicted with certainty. Management currently believes that the ultimate resolution of these matters will not have a material adverse impact on the financial condition, results of operations or liquidity of the Company.

(9)Other Income (Expense)

A summary of other income (expense) is as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Accrual for loss contingency related to legal proceedings (Note 8)	$	(110,000	)	$	—	$	(110,000	)	$	—
Gain on sale of investment	3,591			—		3,591			—
Other income (expense)	(709		)	895		318			209
Total other income (expense)	$	(107,118	)	$	895	$	(106,091	)	$	209

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(10)Details of Selected Balance Sheet Accounts

A summary of inventories is as follows (in thousands):	June 30, 2013			December 31, 2012
Raw materials and subassemblies	$	52,881		$	49,421
Work-in-process	10,110			8,613
Finished goods	31,173			26,880
Reserve for excess and obsolete inventories	(14,669		)	(14,239		)
Total	$	79,495		$	70,675

A summary of other long-term liabilities is as follows (in thousands):	June 30, 2013		December 31, 2012
Accrual for loss contingency related to legal proceedings	$	120,000	$	—
Facility restructuring accrual	4,702		5,073
Other long-term liabilities	7,637		3,058
Total	$	132,339	$	8,131

At December 31, 2012, the Company had an accrual for loss contingency related to legal proceedings of $10.0 million, which was reflected in Accrued Expenses. As of June 30, 2013, that amount was reclassified into other long-term liabilities.

(11)Accumulated Other Comprehensive Income (Loss)

A summary of changes in accumulated other comprehensive income (loss) by component is as follows (in thousands):

	Foreign currency translation adjustments			Equity interest in investees’ other comprehensive income (loss)			Unrealized income (loss) on available-for-sale securities				Other changes in other comprehensive income (loss)				Total
Accumulated other comprehensive income (loss) at December 31, 2012	$	(12,638	)	$	1,214		$	(305	)		$	(157	)		$	(11,886	)
Other comprehensive income (loss) before reclassifications	(3,044		)	(549		)	177				—				(3,416		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			—			99			(1)	79			(2)	178
Net current-period other comprehensive income (loss)	(3,044		)	(549		)	276				79				(3,238		)
Accumulated other comprehensive income (loss) at June 30, 2013	$	(15,682	)	$	665		$	(29	)		$	(78	)		$	(15,124	)

(1)	Previously unrealized income (loss) on available-for-sale securities now recognized in other income (expense), net on the Condensed Consolidated Statement of Operations
(2)	Items previously recognized in other changes in other comprehensive income (loss) now recognized in interest expense on the Condensed Consolidated Statement of Operations

(12)Supplemental Cash Flow Information and Non-cash Activity

A summary of non-cash items from investing and financing activities is as follows (in thousands):

	Six Months Ended June 30,
	2013		2012
Purchases of computer equipment financed through capital leases	$	2,465	$	2,953
Leasehold improvement paid by landlord	$	1,738	$	—
Conversion of investment in a convertible note to equity	$	6,765	$	—
Transfer of inventory to seismic rental equipment	$	—	$	6,053

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(13)Related Party Transactions

BGP owned approximately 15.2% of the Company’s outstanding common stock as of June 30, 2013. For the six months ended June 30, 2013 and 2012, the Company recorded revenues from BGP of $2.9 million and $10.2 million, respectively. Total receivables due from BGP were $2.7 million at June 30, 2013. During the six months ended June 30, 2013, the Company paid to BGP $33.5 million for seismic acquisition services provided on a large 3D marine project; the Company’s accounts payable owed to BGP for those same services was $10.9 million as of June 30, 2013.

For the six months ended June 30, 2013, the Company sold equipment to GeoRXT for $6.8 million, which was due to be paid in May 2013. This receivable remained outstanding at June 30, 2013. The payment of the purchase price for this equipment is guaranteed by the Company’s majority joint venture partner in GeoRXT, Georadar. The Company initially deferred 30% (ION’s ownership percentage in GeoRXT) of its profit on this sale and is being recognized over the period that GeoRXT depreciates the equipment.

On July 1, 2013, the Company agreed to loan up to $10 million to INOVA Geophysical through a promissory note due on September 30, 2013, and accruing interest at an annual rate equal to the London Interbank Offered Rate plus 650 basis points. Also on July 1, 2013, the Company advanced $5 million to INOVA Geophysical under this promissory note. On July 22, 2013, the Company advanced the remaining $5 million to INOVA Geophysical. This loan is to support short-term working capital needs from time-to-time.

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Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations

Executive Summary

The terms “we,” “us” and similar or derivative terms refer to ION Geophysical Corporation and its consolidated subsidiaries, except where the context otherwise requires.

Restatement

See Note 1 to the Unaudited Condensed Consolidated Financial Statements for an explanation regarding the restatement of our condensed consolidated statement of cash flows for the six months ended June 30, 2013.

In connection with the preparation of our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, we determined that we had incorrectly presented the investments in our multi-client seismic data libraries, or SPANs, in our condensed consolidated statements of cash flows. We incorrectly included non-cash activity related to the investment in our multi-client seismic data libraries, which resulted in an understatement of our net cash provided by operating activities and an understatement of our net cash used in investing activities. These investment items should have instead been included and presented as additions to our net cash used in investing activities in our condensed consolidated statement of cash flows for the six months ended June 30, 2013.

For the six months ended June 30, 2013, the restatement had the effect of increasing our net cash provided by operating activities from $28.3 million to $43.4 million and increasing our net cash used in investing activities from $49.7 million to $64.8 million. These adjustments do not have any effect on our condensed consolidated balance sheets, our condensed consolidated statements of income (loss) or our condensed consolidated statements of comprehensive income (loss), as of and for the interim period ended June 30, 2013. The adjustments have no effect on our business operations, cash balances or liquidity.

Our Business

We are a global, technology-focused seismic solutions company. Our services and products include data processing and reservoir imaging services; planning services for survey design and optimization; navigation, command and control, and data management software products; and marine and land seismic data acquisition equipment. In addition, we maintain a multi-client data library with seismic data acquired and processed from surveys of offshore and onshore regions around the world. We serve customers in all major energy producing regions of the world from strategically located offices in 20 cities on five continents.

For over 45 years we have been engaged in providing industry leading seismic data acquisition technology, such as full-wave imaging capability with VectorSeis^® products, the ability to record seismic data from basins that underlie ice fields in polar regions and cableless seismic techniques. The advanced technologies we currently offer include DigiSTREAMER™, Orca^®, our WiBand™ data processing technology, and INOVA Geophysical's lower-cost cableless Hawk™ land system, improved FireFly^® system (FireFly DR31) and a new cabled system (G3i™), each of which is designed to deliver improvements in both image quality and productivity. We have more than 550 patents and pending patent applications in various countries around the world. Approximately 50% of our employees are involved in technical roles and approximately 21% of our employees have advanced degrees.

Seismic imaging plays a fundamental role in hydrocarbon exploration and reservoir development by delineating structures, rock types and fluid locations in the subsurface. Our services, technologies and products are used by oil and gas exploration and production (“E&P”) companies and seismic acquisition contractors to generate high-resolution images of the Earth's subsurface in order to identify new sources of hydrocarbons and pinpoint drilling locations for wells, which can be costly and involve high risk.

We provide our services and products through three business segments – Solutions, Systems and Software. In addition, we have a 49% ownership interest in our INOVA Geophysical joint venture.

Solutions. Our Solutions business provides advanced seismic data processing services for marine and land environments, reservoir solutions, onboard processing and quality control, seismic data libraries, and services by our GeoVentures^® group. We maintain approximately 10.5 petabytes of seismic data storage in 12 global data centers, including our largest data center in Houston, which will soon be moving into a new facility.

Our GeoVentures services are designed to manage the entire seismic process, from survey planning and design to data acquisition and management, through pre-processing and final subsurface imaging. The GeoVentures group focuses on the technologically intensive components of the image development process, such as survey planning and design and data processing and interpretation, and outsources the logistics components (such as field acquisition) to experienced seismic and other geophysical contractors.

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Our GXT Imaging Solutions group offers processing and imaging services designed to help our E&P customers reduce exploration and production risk, evaluate and develop reservoirs and increase production. GXT develops a series of subsurface images by applying its processing technology to data owned or licensed by its customers and also provides its customers with support services (including onboard seismic vessel services), such as data pre-conditioning for imaging and outsourced management (including quality control) of seismic data acquisition and image processing services.

The Solutions business focuses on providing services and products for challenging environments, such as the Arctic frontier; complex and hard-to-image geologies, such as deepwater subsurface salt formations in the Gulf of Mexico and offshore West Africa and Brazil; unconventional reservoirs, such as those found in shale, tight gas and oil sands formations; and offshore basin-wide seismic data and imaging programs. Since 2002, the development of our basin exploration seismic data programs has resulted in a substantial data library that covers significant portions of many of the frontier basins in the world, including offshore East and West Africa, India and Brazil, and in the Arctic and deepwater Gulf of Mexico.

Software. Our Software business provides command and control software systems and related services for navigation and data management functions involving towed marine streamer and seabed operations. Our proprietary software, with over 13 million lines of code, is installed on towed streamer marine vessels worldwide and is a component of many re-deployable and permanent seabed monitoring systems. Through our Software business, we provide marine imagining, seabed imaging and survey design, planning and optimization.

Systems. Our Systems business is engaged in the manufacture of (i) towed streamer and re-deployable ocean-bottom cable seismic data acquisition systems and shipboard recorders; (ii) marine streamer positioning and control systems and energy sources; and (iii) analog geophone sensors.

INOVA Geophysical. We conduct our land seismic equipment business through INOVA Geophysical Equipment Limited (“INOVA Geophysical” or “INOVA”), a joint venture with BGP Inc. (“BGP”). BGP is a subsidiary of China National Petroleum Corporation, and is generally regarded as the world's largest land geophysical service contractor. BGP owns a 51% equity interest in INOVA Geophysical, and we own the remaining 49% interest. INOVA manufactures cable-based, cableless and radio-controlled seismic data acquisition systems, digital sensors, vibroseis vehicles (i.e., vibrator trucks) and source controllers for detonator and energy sources business lines. INOVA's research and development centers are located primarily in the U.S. and Canada, although the joint venture intends to evaluate lower-cost manufacturing opportunities in China. In addition, we and BGP often field-test, and we expect to field-test further, INOVA's new technologies and related equipment for operational feedback and quality improvements.

Economic Conditions

Demand for our seismic data acquisition services and products has traditionally been cyclical and substantially dependent upon activity levels in the oil and gas industry, particularly our customers’ willingness and ability to expend their capital for oil and natural gas exploration and development projects. This demand is sensitive to current and expected future crude oil and natural gas prices. During the second quarter of 2013, West Texas Intermediate (“WTI”) spot crude oil prices began the quarter near $98 per barrel falling to approximately $87 per barrel before slowly rising through the quarter to close near $97 per barrel. Similar to the first quarter of 2013, Brent crude oil prices did not follow a similar pattern to WTI this quarter. Brent crude oil prices started the quarter near $110 per barrel and quickly fell to a low of $98 per barrel. It then traded in a tighter range, finishing the quarter near $103 per barrel. The spread between WTI and Brent crude oil prices has narrowed substantially during 2013 from the typical spreads experienced in 2012.

Energy price forecasts are by their nature highly uncertain, but external reports indicate that WTI crude oil prices and Brent crude oil prices are expected to remain in price ranges of $80 to $110 and $85 to $115 per barrel, respectively, for 2013 as demand outpaces supply.

U.S. natural gas prices continued their slow climb upward from the low prices experienced in 2012. U.S. Henry Hub natural gas prices started the quarter near $3.90 per MMBtu, trading up to a peak near $4.45 per MMBtu in late April and early May. Prices then slowly trended lower for the remainder of the quarter, ending near the quarter low price of $3.55 per MMBtu. We believe demand for natural gas will continue to grow because it is increasingly being used to supplant coal as the preferred fuel for the generation of U.S. electric power.

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For the first half of 2013, our Solutions segment revenues grew compared to the first half of 2012 due to increase in new ventures revenue, mostly due to a large 3D marine program that commenced acquisition activities during the fourth quarter of 2012 and continued through July of 2013.  Additionally, our data processing revenues grew by over 20%, with further international penetration, generating record revenues, driven by strong demand in Europe, the Middle East and the Gulf of Mexico, and continued demand for our broadband processing solution, WiBand. However, our data library sales fell slightly compared to the first half of 2012 due to delays in licensing rounds for blocks offshore Tanzania and Greenland, and a smaller than expected licensing round in the pre-salt region of Brazil. For the first half of 2013, our investment in multi-client programs was significantly lower compared to the first half of 2012 due to the start of several programs moving from the first half to the second half of 2013; this should have the effect of significantly increasing our multi-client program investments in the second half of 2013. Even though our Solutions revenues were up, gross margins decreased during the first half of 2013 due to cost overruns as we completed acquisition on our 3D marine program.

At June 30, 2013, our Solutions segment backlog, which consists of commitments for (i) data processing work and (ii) both multi-client new venture projects and proprietary projects by our GeoVentures group underwritten by our customers, was $139.2 million, compared with backlog of $151.3 million at December 31, 2012 and $152.7 million at June 30, 2012. The decline in backlog during the first half of 2013 was due to the recognition of revenue related to work performed on our large 3D marine program. This decline in backlog was partially offset by several new GeoVentures client underwriting commitments on programs expected to commence during the second half of 2013. We anticipate that the majority of our backlog will be recognized as revenue over the remainder of 2013.

Revenues for our Systems segment decreased in the first half of 2013 compared to the first half of 2012. Sales of our positioning products decreased primarily due to modest new product sales as the industry continues to work through spare capacity from the recent consolidation of seismic contractors.

Our Software segment revenues decreased for the first half of 2013, compared to the same period of 2012, due in part to decreased revenues from our Gator^® seabed software and from our Orca towed streamer software. The reduction in revenues for seabed software was due to a reduction in seabed contractors, with our previous customer, Reservoir Exploration Technology, ASA (“RXT”), filing for bankruptcy. The declines in towed streamer software revenues were due to consolidation in the towed streamer contractor sector.

INOVA Geophysical reported a decrease in revenues and gross profits for the quarter ended March 31, 2013, compared to the quarter ended March 31, 2012. The decrease in revenues was principally due to reduced sales of INOVA Geophysical’s vibrator trucks, and reduced revenues for leasing its rental equipment compared to the significant rental activity that it experienced during the 2012 period.

It is our view that technologies that add a competitive advantage through improved imaging, cost reductions or improvements in well productivity will continue to be valued in our marketplace. We believe that our newest technologies, such as Calypso™, our next-generation VSO ocean-bottom cable system, WiBand broadband data processing technology, DigiStreamer, Orca and INOVA Geophysical’s newest technologies, will continue to attract customer interest, because those technologies are designed to deliver improvements in image quality within more productive delivery systems.

We expect the growth in demand for seismic services to continue to remain positive for the remainder of 2013. However, in stating this expectation, we are assuming that (i) the global and U.S. economies will not slip back into a recession, (ii) the prices of WTI and Brent crude oil will predominantly remain above $80 and $100 per barrel, respectively, and (iii) the level of exploration and development activities in Europe, the Middle East, and the Gulf of Mexico will continue to increase. Beginning in the third quarter of 2011 U.S. Gulf of Mexico drilling activity has shown signs of a slow but steady recovery as permitting levels have improved and the number of drilling rigs working in U.S. offshore waters has increased from an average of 45 in the first half of 2012 to 52 in the first half of 2013.

Senior Secured Second-Priority Notes

On May 13, 2013, we sold $175 million aggregate principal amount of 8.125% Senior Secured Second-Priority Notes due 2018 (“Notes”) in a private offering.  The Notes are senior secured second-priority obligations, are guaranteed by our material U.S. subsidiaries, and mature on May 15, 2018.  Interest on the Notes will accrue at the rate of 8.125% per annum and will be payable semiannually in arrears on May 15 and November 15 of each year during their term, commencing on November 15, 2013.

We used the net proceeds from the offering to repay outstanding indebtedness under our senior secured credit facility with China Merchants Bank Co., Ltd., New York Branch, as administrative agent and lender (“CMB”), and for general corporate purposes. With the repayment of the outstanding amounts in May 2013, we have the full $175 million available to us under the Credit Facility. For further information regarding these Notes and our Credit Facility, see Note 5 “Long-term Debt” at Notes to Unaudited Condensed Consolidated Financial Statements.

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Investment in GeoRXT

In February 2013, we purchased from Reservoir Exploration Technology, ASA a 30% interest in a joint venture entity, GeoRXT B.V. (“GeoRXT”) for $1.5 million. GeoRXT is headquartered in Rio de Janeiro, Brazil, and specializes in seismic acquisition operations using ocean-bottom cables deployed from vessels leased by GeoRXT. We were granted an option, exercisable at any time on or prior to May 15, 2013, to increase our ownership percentage to 50%, which would have required making additional capital contributions into GeoRXT of $40.0 million. Additionally, we provided GeoRXT with an $8.0 million working capital loan, the repayment of which is guaranteed by our majority joint venture partner in GeoRXT, Georadar Levantamentos Geofisicos S/A (“Georadar”). The stated maturity date of the loan was May 25, 2013. We are continuing to perform a due diligence review of GeoRXT and have not yet increased our ownership interest in GeoRXT to a 50% equity interest. If we increase our ownership interest in GeoRXT, a portion of the required capital contribution to GeoRXT for the additional equity interest will likely be funded through the conversion of the loan into equity. As a result, we have elected to allow this loan to remain outstanding until we decide whether to increase our ownership interest.

The GeoRXT joint venture has experienced a pull-back in business in their home market of Brazil, which resulted in a significant decrease in their anticipated backlog. We have been assisting the joint venture with their move into the international market, getting them prequalified to work for E&P companies through the tender cycle, which is taking time. While we had expected by now to have increased our interest in GeoRXT to 50%, we have delayed doing so, while the joint venture works to secure a stronger backlog, within Brazil and beyond. Despite this delay, we remain fully committed to putting our Calypso seabed acquisition technology to work in a service model to meet the growing demand for seabed seismic.

Polarcus Alliance

On July 26, 2013, we announced the formation of a multi-year strategic alliance with Polarcus to jointly develop, execute and market 3D multi-client seismic programs globally. The alliance is intended to leverage the complementary strengths of our two companies to deliver a differentiated 3D multi-client offering to meet oil companies' growing demand for higher quality 3D seismic data. The alliance will utilize petroleum system insights into key basins derived from our 2D BasinSPAN™ data library, to locate and design surveys to address specific geological challenges. The 3D multi-client surveys will be acquired using Polarcus' fleet of seismic vessels and will incorporate a broadband solution combining Polarcus' RIGHTBAND™ acquisition and survey design methodology and our WiBand data processing technology.

WesternGeco Legal Proceedings

A verdict was returned by the jury in this lawsuit in August 2012, finding that we willfully infringed the claims contained in four patents and awarded WesternGeco the sum of $105.9 million in damages, consisting of $12.5 million in reasonable royalty and $93.4 million in lost profits.

In June 2013, the presiding judge in the WesternGeco lawsuit entered a Memorandum and Order rejecting the jury’s finding of willfulness and denying WesternGeco’s motions for willfulness and enhanced damages, but also denying our post-verdict motions that challenged the jury’s infringement findings and the damages amount. Based on our analysis after the trial court’s Memorandum and Order we concluded, in connection with the preparation of our financial statements contained in this Quarterly Report on Form 10-Q, that we should increase our loss contingency accrual related to this case from $10.0 million to $120.0 million. The accrual amount consists of jury verdict damages, court costs, and estimates of prejudgment interest and supplemental damages. Upon any further rulings or developments in the case, we will evaluate whether the accrual should be further adjusted. See further discussion at Part II, Item 1A. – “Risk Factors — An unfavorable judgment in our pending litigation matter with WesternGeco could have a material adverse effect on our financial results and liquidity” and Part II, Item 1. – “Legal Proceedings.”

Estimated amounts of loss contingency accruals disclosed in this Quarterly Report on Form 10-Q or elsewhere are based on currently available information and involve elements of judgment and significant uncertainties. Actual losses may exceed or be considerably less than these accrual amounts.

Key Financial Metrics

The table below provides an overview of key financial metrics for our company as a whole and our three business segments during the three and six months ended June 30, 2013, compared to those for the same periods of 2012. For certain tabular information on the operating results of our INOVA Geophysical joint venture, as well as textual information about our GeoRXT joint venture, see “— Results of Operations — Other Items — Equity in Earnings (Losses) of Investments.”

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	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(in thousands, except per share amounts)
Net revenues:
Solutions:
New Venture	$	33,249		$	21,544		$	81,685		$	50,538
Data Library	21,521			22,235			30,969			32,503
Total multi-client revenues	54,770			43,779			112,654			83,041
Data Processing	33,849			28,190			65,135			55,055
Total	$	88,619		$	71,969		$	177,789		$	138,096
Systems:
Towed Streamer	$	12,570		$	13,727		$	26,119		$	29,531
Ocean Bottom	383			1,616			7,148			5,135
Other	10,895			7,476			22,428			24,859
Total	$	23,848		$	22,819		$	55,695		$	59,525
Software:
Software Systems	$	7,464		$	9,551		$	15,405		$	17,921
Services	984			875			1,763			1,382
Total	$	8,448		$	10,426		$	17,168		$	19,303
Total	$	120,915		$	105,214		$	250,652		$	216,924
Gross profit:
Solutions	$	21,890		$	28,904		$	42,087		$	47,889
Systems	8,802			9,234			17,182			25,046
Software	5,926			7,805			12,306			14,164
Total	$	36,618		$	45,943		$	71,575		$	87,099
Gross margin:
Solutions	25		%	40		%	24		%	35		%
Systems	37		%	40		%	31		%	42		%
Software	70		%	75		%	72		%	73		%
Total	30		%	44		%	29		%	40		%
Income from operations:
Solutions	$	11,021		$	17,434		$	18,378		$	27,040
Systems	1,504			995			2,438			9,735
Software	4,955			6,879			10,116			12,361
Corporate and other	(10,710		)	(12,336		)	(22,239		)	(24,521		)
Total	$	6,770		$	12,972		$	8,693		$	24,615
Operating margin:
Solutions	12		%	24		%	10		%	20		%
Systems	6		%	4		%	4		%	16		%
Software	59		%	66		%	59		%	64		%
Corporate and other	(9		)%	(12		)%	(9		)%	(11		)%
Total	6		%	12		%	3		%	11		%
Net income (loss) applicable to common shares	$	(71,134	)	$	12,039		$	(69,597	)	$	20,276
Basic and diluted net income (loss) per common share	$	(0.45	)	$	0.08		$	(0.44	)	$	0.13

We intend that the following discussion of our financial condition and results of operations will provide information that will assist in understanding our consolidated financial statements, the changes in certain key items in those financial statements from quarter to quarter, and the primary factors that accounted for those changes.

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On April 17, 2013, we filed on Form 10-K/A, an Amendment No. 1 to our Annual Report on Form 10-K in order to file separate consolidated financial statements for INOVA Geophysical for the fiscal year ended December 31, 2012, as required under SEC Regulation S-X.

For a discussion of factors that could impact our future operating results and financial condition, see Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012, and Item 1A. “Risk Factors” in Part II of this Form 10-Q.

The information contained in this Quarterly Report on Form 10-Q contains references to trademarks, service marks and registered marks of ION and our subsidiaries, as indicated. Except where stated otherwise or unless the context otherwise requires, the terms “GeoVentures,” “DigiFIN,” “VectorSeis,” “FireFly,” “ARIES II,” “Orca,” “GATOR,” and “Scorpion” refer to GeoVentures^®, DigiFIN^®, VECTORSEIS^®, FIREFLY^®, ARIES^® II, ORCA^®, GATOR^® and SCORPION^® registered marks owned by ION or INOVA Geophysical, and the terms “DigiSTREAMER,” “Hawk,” “UniVib,” “G3i,” “Calypso,” and “WiBand” refer to DigiSTREAMER™, Hawk™, UniVib™, G3i™, Calypso™ and WiBand™ trademarks and service marks owned by ION or INOVA Geophysical.

Results of Operations

Three Months Ended June 30, 2013 Compared to Three Months Ended June 30, 2012

Our overall total net revenues of $120.9 million for the three months ended June 30, 2013 (the “Current Quarter”) increased $15.7 million, or 15%, compared to total net revenues for the three months ended June 30, 2012 (the “Comparable Quarter”). Our overall gross profit percentage for the Current Quarter was 30%, compared to 44% for the Comparable Quarter. Total operating expenses as a percentage of net revenues for the Current Quarter were 25% compared to 31% in the Comparable Quarter. For the Current Quarter, our income from operations was $6.8 million, compared to $13.0 million for the Comparable Quarter. Net loss for the Current Quarter was $(71.1) million, or $(0.45) per diluted share, compared to net income of $12.0 million, or $0.08 per diluted share, in the Comparable Quarter. The Current Quarter included an accrual related to the WesternGeco legal matter of $71.5 million, net of tax.

Net Revenues, Gross Profits and Gross Margins

Solutions — Net revenues for the Current Quarter increased by $16.6 million, or 23%, to $88.6 million, compared to $72.0 million for the Comparable Quarter. This increase was predominantly driven by (i) growth in new venture revenues, mostly due to a large multi-quarter 3D marine program, and (ii)  growth in our data processing business driven by strong demand in Europe, the Middle East and the Gulf of Mexico, and continued demand for our WiBand data processing technology. Gross profit decreased by $7.0 million to $21.9 million, representing a 25% gross margin, compared to $28.9 million, which represented a 40% gross margin, in the Comparable Quarter. The decrease in gross margin was related to cost overruns as we completed acquisition on our large 3D marine program.

Systems — Net revenues for the Current Quarter increased by $1.0 million, or 4%, to $23.8 million, compared to $22.8 million for the Comparable Quarter. Gross profit decreased by $0.4 million to $8.8 million, representing a 37% gross margin, for the Current Quarter compared to $9.2 million, representing a 40% gross margin, for the Comparable Quarter. The changes within the revenue category were principally due to the continued slowdown of new vessel construction compared to that for the Comparable Quarter, leading to decreased sales of new towed streamer systems. This decrease in revenues was partially offset by increasing levels of repair work from customers for their existing installed base of our products. The decrease in gross margin is primarily the result of the change in the sales mix of products sold during the quarter.

Software — Net revenues for the Current Quarter decreased$2.0 million, or 19%, to $8.4 million, compared to $10.4 million for the Comparable Quarter. Gross profit for the Current Quarter decreased $1.9 million to $5.9 million, representing a 70% gross margin, compared to $7.8 million, representing a 75% gross margin for the Comparable Quarter. This decrease in revenues and gross margin was due in part to decreased revenues from our Gator seabed software and declines in our Orca towed streamer software revenues. The reduction in revenues for seabed software was due to a reduction in seabed contractors, with our previous customer, RXT, filing for bankruptcy. The declines in towed streamer software revenues were due to consolidation in the towed streamer contractor sector.

Operating Expenses

Research, Development and Engineering — Research, development and engineering expense was $9.1 million, or 8% of net revenues, for the Current Quarter, a decrease of $1.2 million compared to $10.3 million, or 10% of net revenues, for the Comparable Quarter. The Comparable Quarter included significant field testing of Calypso, our next generation re-deployable seabed seismic data acquisition system.

Marketing and Sales — Marketing and sales expense was $9.0 million, or 7% of net revenues, for the Current Quarter, which is comparable to $8.7 million, or 8% of net revenues, for the Comparable Quarter.

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General, Administrative and Other Operating Expenses — General, administrative and other operating expenses of $11.8 million, or 10% of net revenues, for the Current Quarter, represented a decrease of $2.2 million compared to $14.0 million, or 13% of net revenues, for the Comparable Quarter. This decrease was due to lower legal fees, which were high in the Comparable Quarter due to then-outstanding litigation.

Other Items

Interest Expense, net — Interest expense, net, was $2.8 million for the Current Quarter compared to $1.4 million for the Comparable Quarter. This increase is directly related to our issuance of the Notes, which carry a higher interest rate than the rate on our revolving line of credit indebtedness, and resulted in a higher level of combined outstanding indebtedness during the Current Quarter (see “— Liquidity and Capital Resources — Capital Requirements and Sources of Capital” below).

Equity in Earnings (Losses) of Investments — We account for our equity investments in both INOVA Geophysical and GeoRXT as equity method investments.

We record our share of earnings and losses of our 49% interest in INOVA Geophysical on a one fiscal quarter lag basis. Thus, our share of INOVA Geophysical’s losses for the three months ended March 31, 2013 is included in our financial results for the Current Quarter. For the Current Quarter, we recorded approximately $(4.7) million of equity in losses of INOVA Geophysical compared to $3.8 million of equity in earnings for the Comparable Quarter. The losses in 2013 were principally due to a decrease in net revenues attributable to reduced sales of INOVA Geophysical’s vibrator trucks and reduced revenues from rental equipment leasing compared to the significant rental activity that it experienced during the 2012 period.

The following table reflects the summarized financial information for INOVA Geophysical for the three months ended March 31, 2013 and 2012 (in thousands):

	Three months ended March 31,
	2013			2012
Net revenues	$	22,095		$	56,779
Gross profit	$	1,808		$	19,502
Income (loss) from operations	$	(8,511	)	$	8,910
Net income (loss)	$	(9,772	)	$	8,654

In late February 2013, we purchased a 30% interest in GeoRXT. We record our share of earnings in GeoRXT related to our interest in GeoRXT on a current quarter basis, unlike our recording of earnings in INOVA Geophysical, which are recorded on a one fiscal quarter-lag basis. Thus, our share of GeoRXT’s losses during the Current Quarter was approximately $(1.6) million. Our share of losses for the three months ended June 30, 2013 would have effectively reduced our equity method investment in GeoRXT to be less than zero. Therefore, we reduced our equity method investment in GeoRXT to zero and recorded the balance of our share of such losses, totaling $(0.8) million, against the outstanding working capital loan note receivable owed to us by GeoRXT (see Note 3 “Equity Method Investments”).

The following table reflects the summarized financial information for GeoRXT for the three months ended June 30, 2013 (in thousands):

	Three months ended June 30, 2013
Net revenues	$	13,698
Gross profit	$	(195	)
Loss from operations	$	(5,107	)
Net loss	$	(5,151	)

Other Income (Expense) — Other income (expense) for the Current Quarter was $(107.1) million compared to other income of $0.9 million for the Comparable Quarter. This difference was primarily related to the loss contingency accrual for our legal proceedings.

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The following table reflects the significant items of other income (expense) as follows (in thousands):

	Three Months Ended June 30,
	2013			2012
Accrual for loss contingency related to legal proceedings (Note 8)	$	(110,000	)	$	—
Gain on sale of investment	3,591			—
Other income (expense)	(709		)	895
Total other income (expense)	$	(107,118	)	$	895

Income Tax Expense (Benefit) — Income tax expense (benefit) for the Current Quarter was $(38.7) million compared to $4.2 million for the Comparable Quarter. Our effective tax rates for the Current Quarter and Comparable Quarter were 35.4% and 25.7%, respectively. The increase in our effective tax rate for the Current Quarter as compared to the Comparable Period was primarily due to the tax impact of the loss contingency accrual for our legal proceedings recognized during the Current Quarter.

Preferred Stock Dividends — The preferred stock dividend relates to our Series D Preferred Stock. Quarterly dividends must be paid in cash. Dividends are paid at a rate equal to the greater of (i) 5.0% per annum or (ii) the three month LIBOR rate on the last day of the immediately preceding calendar quarter plus 2.5% per annum. The Series D Preferred Stock dividend rate was 5.0% at June 30, 2013.

Six Months Ended June 30, 2013 Compared to Six Months Ended June 30, 2012

Our overall total net revenues of $250.7 million for the six months ended June 30, 2013 (the “Current Period”) increased$33.8 million, or 16%, compared to total net revenues for the six months ended June 30, 2012 (the “Comparable Period”). Our overall gross profit percentage for the Current Period was 29%, compared to 40% for the Comparable Period. Total operating expenses as a percentage of net revenues for the Current Period were 25% compared to 29% in the Comparable Period. For the Current Period, our income from operations was $8.7 million, compared to $24.6 million for the Comparable Period. Net loss for the Current Period was $(69.6) million, or $(0.44) per diluted share, compared to net income of $20.3 million, or $0.13 per diluted share, in the Comparable Period. The Current Period included an accrual related to the WesternGeco legal matter of $71.5 million, net of tax.

Net Revenues, Gross Profits and Gross Margins

Solutions — Net revenues for the Current Period increased by $39.7 million, or 29%, to $177.8 million, compared to $138.1 million for the Comparable Period. This increase was predominantly driven by (i) growth in new ventures, mostly due to a large multi-quarter 3D marine program, and (ii)  growth in our data processing business driven primarily by strong demand in Europe, the Middle East and the Gulf of Mexico, and continued demand for our WiBand data processing technology. Gross profit decreased by $5.8 million to $42.1 million, representing a 24% gross margin, compared to $47.9 million, representing a 35% gross margin, in the Comparable Period. The decrease in gross margin was primarily related to cost overruns on our 3D marine program during the Current Period.

Systems — Net revenues for the Current Period decreased by $3.8 million, or 6%, to $55.7 million, compared to $59.5 million for the Comparable Period. Gross profit decreased by $7.8 million to $17.2 million, representing a 31% gross margin, for the Current Period compared to $25.0 million, representing a 42% gross margin, for the Comparable Period. This decrease in revenues and gross profits in the Current Period was principally due to the continued slowdown of new vessel construction as compared to the Comparable Period, leading to decreased sales of new towed streamer systems, partially offset by increasing levels of repair work from the existing installed base of product with our customers and increased sales of ocean-bottom cable equipment in the Current Period. The decrease in gross margin is primarily the result of the change in the sales mix of products sold during the half of 2013.

Software — Net revenues for the Current Period decreased by $2.1 million, or 11%, to $17.2 million, compared to $19.3 million for the Comparable Period. Gross profit for the Current Period decreased$1.9 million, or 13%, to $12.3 million, compared to $14.2 million in the Comparable Period. This decrease in revenues was due in part to decreased revenues from our Gator seabed software and declines in our Orca towed streamer software revenues. The reduction in revenues for seabed software was due to a reduction in seabed contractors, with our previous customer, RXT, filing for bankruptcy. The declines in towed streamer software revenues were due to consolidation in the towed streamer contractor sector. However, gross margin of 72% in the Current Period remained essentially constant with the 73% gross margin in the Comparable Period.

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Operating Expenses

Research, Development and Engineering — Research, development and engineering expense was $18.4 million, or 7% of net revenues, for the Current Period, an increase of $0.4 million compared to $18.0 million, or 8% of net revenues, for the Comparable Period. During the Current Period, we continued to invest in our next generation of seismic acquisition products and services, which includes Calypso, our next generation re-deployable seabed seismic data acquisition system.

Marketing and Sales — Marketing and sales expense was $16.9 million, or 7% of net revenues, for the Current Period, an increase of $0.8 million compared to $16.1 million, or 7% of net revenues, for the Comparable Period.

General, Administrative and Other Operating Expenses — General, administrative and other operating expenses were $27.6 million, or 11% of net revenues, for the Current Period, which amount was comparable to $28.4 million, or 13% of net revenues, for the Comparable Period. The Current Period includes bad debt expense of $2.9 million, primarily related to the bankruptcy of one of our underwriting clients in our Solutions segment, partially offset by lower legal fees.

Other Items

Interest Expense, net — Interest expense, net, was $3.8 million for the Current Period compared to $2.9 million for the Comparable Period. This increase is directly related to the issuance of Notes, which incur a higher interest rate and have a higher outstanding balance than the outstanding balance on our revolving line of credit in the Comparable Period (see “— Liquidity and Capital Resources — Capital Requirements and Sources of Capital” below).

Equity in Earnings (Losses) of Investments — We account for our equity investments in both INOVA Geophysical and GeoRXT as equity method investments.

We record our share of earnings and losses of our 49% interest in INOVA Geophysical on a one fiscal quarter lag basis. Thus, our share of INOVA Geophysical’s losses for the six month period from October 1, 2012 through March 31, 2013 was included in our financial results for the Current Period. For the Current Period, we recorded approximately $(2.9) million of equity in losses of INOVA Geophysical compared to $6.2 million of equity in earnings for the Comparable Period. The following table reflects the summarized financial information for INOVA Geophysical for the six-month periods from October 1 to March 31 of 2013 and 2012 (in thousands):

	Six-Month Period from October 1 through March 31
	2013			2012
Net revenues	$	81,706		$	115,777
Gross profit	$	14,135		$	33,466
Income (loss) from operations	$	(8,761	)	$	15,419
Net income (loss)	$	(6,030	)	$	14,371

In late February 2013, we purchased a 30% interest GeoRXT. We record our share of earnings related to our equity interest in GeoRXT on a current quarter basis, unlike our recording of earnings in INOVA Geophysical, which are recorded on a one fiscal quarter-lag basis. Our share of GeoRXT’s losses during the Current Period was approximately $(2.3) million. This represents $(1.5) million of losses recorded against our equity investment in GeoRXT, which brought the balance in this investment to zero, and $(0.8) million was recorded against the outstanding balance of our note receivable owed by GeoRXT (see Note 3 “Equity Method Investments”).

The following table reflects the summarized financial information for GeoRXT for the period from March 1 to June 30, 2013 (in thousands):

	Period from March 1 to June 30, 2013
Net revenues	$	19,668
Gross profit	$	122
Loss from operations	$	(6,876	)
Net loss	$	(7,045	)

Other Income (Expense) — Other income (expense) for the Current Period was $(107.1) million compared to other income of $0.9 million for the Comparable Period. This difference was primarily related to the loss contingency accrual recorded with respect to certain of our legal proceedings.

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The following table reflects the significant items of other income (expense) as follows (in thousands):

	Six Months Ended June 30,
	2013			2012
Accrual for loss contingency related to legal proceedings (Note 8)	$	(110,000	)	$	—
Gain on sale of investment	3,591			—
Other income (expense)	318			209
Total other income (expense)	$	(106,091	)	$	209

Income Tax Expense (Benefit) — Income tax expense (benefit) for the Current Period was $(37.5) million compared to $7.6 million for the Comparable Period. Our effective tax rates for the Current Period and Comparable Period were 35.2% and 27.1%, respectively. The change in our effective tax rate for the Current Period as compared to the Comparable Period was primarily due to the tax impact of the loss contingency accrual for our legal proceedings recognized during the Current Period.

Preferred Stock Dividends — The preferred stock dividend relates to our Series D Preferred Stock. Quarterly dividends must be paid in cash. Dividends are paid at a rate equal to the greater of (i) 5.0% per annum or (ii) the three month LIBOR rate on the last day of the immediately preceding calendar quarter plus 2.5% per annum. The Series D Preferred Stock dividend rate was 5.0% at June 30, 2013.

Liquidity and Capital Resources

Sources of Capital

Our cash requirements include our working capital requirements, and cash required for our debt service payments, seismic data acquisition projects and capital expenditures. As of June 30, 2013, we had working capital of $236.1 million, which included $109.5 million of cash on hand. Capital requirements are primarily driven by our continued investment in our multi–client seismic data library (totaling $48.6 million for the Current Period) and, to a lesser extent, our inventory purchase obligations. Also, our headcount is a significant driver of our working capital needs. Because a significant portion of our business is involved in the planning, processing and interpretation of seismic data services, one of our largest investments is in our employees, which involves cash expenditures for their salaries, bonuses, payroll taxes and related compensation expenses.

In addition, we are currently performing a due diligence review of GeoRXT to determine whether to increase our ownership percentage in GeoRXT to 50%. We were granted an option, exercisable at any time on or prior to May 15, 2013, to increase our ownership percentage, which would have required a $40 million capital contribution into GeoRXT; approximately $8 million of this amount would be effectively paid through the conversion of the working capital loan we provided to GeoRXT in January 2013. For further discussion on our investment in GeoRXT, see “– Executive Summary – Investment in GeoRXT.”

Our working capital requirements may change from time to time depending upon many factors, including our operating results and adjustments in our operating plan required in response to industry conditions, competition, acquisition opportunities and unexpected events, such as an adverse outcome in our WesternGeco litigation, which is further discussed at Part II, Item 1A. – “Risk Factors — An unfavorable judgment in our pending litigation matter with WesternGeco could have a material adverse effect on our financial results and liquidity” and Part II, Item 1. “Legal Proceedings.” In recent years, our primary sources of funds have been cash flows generated from our operations, our existing cash balances, debt and equity issuances and borrowings under our revolving credit facilities.

Senior Secured Second-Priority Notes — On May 13, 2013, we sold $175 million aggregate principal amount of 8.125% Senior Secured Second-Priority Notes due 2018 in a private offering.  The Notes are senior secured second-priority obligations, are guaranteed by our material U.S. subsidiaries (“the Notes Guarantors”), and mature on May 15, 2018.  Interest on the Notes will accrue at the rate of 8.125% per annum and will be payable semiannually in arrears on May 15 and November 15 of each year during their term, commencing on November 15, 2013.

We used the net proceeds from the offering to repay outstanding indebtedness under our senior secured credit facility, see “- Revolving Line of Credit” below with CMB, and for general corporate purposes. The Notes have not been registered under the Securities Act, or applicable state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws.

On or after May 15, 2015, we may on one or more occasions redeem all or a part of the Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Notes redeemed during the twelve-month period beginning on May 15th of the years indicated below:

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Date	Percentage
2015	104.063	%
2016	102.031	%
2017 and thereafter	100.000	%

For additional information regarding the terms of the Notes and related Indenture, Registration Rights Agreement and Intercreditor Agreement see our Current Report on Form 8-K filed with the SEC on May 13, 2013.

Revolving Line of Credit — On May 29, 2012, we amended the terms of our senior secured credit facility with CMB (the “Credit Facility”). The First Amendment to Credit Agreement and Loan Documents (the “First Amendment”) modified certain provisions of our senior credit agreement with CMB that we had entered into on March 25, 2010.

As amended by the First Amendment, our Credit Facility provides that we may make revolving credit borrowings in U.S. Dollars, Euros, British Pounds Sterling or Canadian Dollars up to an amount not to exceed the U.S. Dollar equivalent of $175.0 million. With repayment of outstanding amounts in May 2013, we have the full amount of the Credit Facility available to us. For further information regarding our Credit Facility, see Note 5 “Long-term Debt” at Notes to Unaudited Condensed Consolidated Financial Statements.

Meeting our Liquidity Requirements

The cash flow information described below reflects the restatement of our condensed consolidated statement of cash flows for the six months ended June 30, 2013.

For the Current Period, total capital expenditures, including investments in our multi-client data library, were $57.6 million, which we anticipate will be significantly higher in the second half of 2013 due to our planned multi-client programs being more heavily weighted to the fourth quarter than in recent years. We are projecting additional capital expenditures for the remaining six months of 2013 to be between $95 million and $115 million. Of the total projected capital expenditures for the remaining six months of 2013, we are estimating that approximately $85 million to $105 million will be spent on investments in our multi-client data library.

We currently believe that our existing cash, cash generated from operations and our sources of working capital will be sufficient for us to meet our anticipated cash needs for at least the next 12 months. However, as described at Part II, Item 1A. – “Risk Factors — An unfavorable judgment in our pending litigation matter with WesternGeco could have a material adverse effect on our financial results and liquidity” and Part II, Item 1. – “Legal Proceedings,” there are possible scenarios involving a future judgment to be rendered in the WesternGeco lawsuit that could adversely affect our liquidity. In order to appeal such a judgment, we may be required to collateralize an appeal bond for the full amount of damages entered in the judgment. To be prepared for a possible adverse judgment in this case, we have arranged with sureties to post an appeal bond on our behalf if necessary. Although the terms of the appeal bond enable each surety to require us to post collateral with the surety at any time the bond is outstanding, for up to the full amount of the bond, each surety has represented to us that such a requirement would only occur in rare circumstances where the surety deems a larger amount of security is necessary. In the unlikely event that we are required to post collateral with a surety during the appeal process, depending on the size of the bond and the level of required collateral, in order to collateralize the bond we might need to utilize a combination of cash on hand, undrawn balances available under our revolving line of credit and possibly incur additional debt and/or equity financing. In addition, we may be required to reduce the amounts we spend on capital expenditures, which could adversely affect our results of operations in future periods.

Cash Flow from Operations

Net cash provided by operating activities was $43.4 million for the Current Period, compared to $85.7 million for the Comparable Period. This decrease in our net cash flows from operating activities was primarily due in part to the decrease in our income from operations for the Current Period compared to the Comparable Period. Our net cash flows provided by operating activities during the Current Period were impacted positively by a significant decrease in accounts receivable, offset by the negative impact from an increase in unbilled receivables and inventory and a decrease in accounts payable, accrued expenses, accrued royalties and deferred revenue.

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Cash Flow from Investing Activities

Net cash used in investing activities was $64.8 million for the Current Period, compared to $39.9 million for the Comparable Period. The principal use of cash in our investing activities during the Current Period was $48.6 million for continued investment in our multi-client data library, $9.0 million for capital expenditures related to property, plant and equipment, and a total $9.5 million investment in GeoRXT. These uses of cash were partially offset by the receipt of $4.2 million from the sale of our investment in a cost method investment. The principal uses of cash in our investing activities during the Comparable Period were $52.6 million for investment in our multi-client data library, and $4.9 million of capital expenditures related to property, plant and equipment, offset by proceeds from the maturity of $20.0 million of short-term investments.

Cash Flow from Financing Activities

Net cash flow provided by financing activities was $70.8 million for the Current Period, compared to a use of cash of $4.9 million for the Comparable Period. The net cash flow provided by financing activities during the Current Period was primarily related to $175.0 million in gross proceeds realized from the issuance of the Notes, $97.3 million of which was applied to pay down the outstanding indebtedness under our revolving line of credit. Other uses of cash in our financing activities during the Current Period were payments of long-term debt of $1.8 million compared to $2.1 million in the Comparable Period.

Inflation and Seasonality

Inflation in recent years has not had a material effect on our costs of goods or labor, or the prices for our products or services. Traditionally, our business has been seasonal, with strongest demand in the fourth quarter of our fiscal year.

Critical Accounting Policies and Estimates

Refer to our Annual Report on Form 10-K for the year ended December 31, 2012 for a complete discussion of our significant accounting policies and estimates. There have been no material changes in the Current Quarter regarding our critical accounting policies and estimates.

Foreign Sales Risks

The majority of our foreign sales are denominated in United States dollars. Product revenues are allocated to geographical locations on the basis of the ultimate destination of the equipment, if known. If the ultimate destination of such equipment is not known, product revenues are allocated to the geographical location of initial shipment. Service revenues, which primarily relate to our GeoVentures division, are allocated based upon the billing location of the customer. For the Current Period and Comparable Period, international sales comprised 74% and 67%, respectively, of total net revenues. The percentage of total sales from foreign countries increased primarily due to a decrease in sales into the U.S., as well as increased sales to customers in Europe, Latin America and the Middle East.

A summary of net revenues by geographic area follows (in thousands):	Six Months Ended June 30,
	2013		2012
Europe	$	118,020	$	82,566
North America	64,804		72,204
Latin America	23,944		20,571
Middle East	24,631		18,539
Asia Pacific	10,366		15,209
Africa	6,491		5,403
Commonwealth of Independent States (CIS)	2,396		2,432
Total	$	250,652	$	216,924

Item 4.Controls and Procedures

Disclosure Controls and Procedures. Disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file with or submit to the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) is recorded, processed, summarized and reported within the time period specified by the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed under the Exchange Act is accumulated and communicated to management, including the principal executive officer and the principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

In connection with the restatement discussed above in the explanatory note to this Form 10-Q/A and in Note 1 “Basis of Presentation and Restatement” of Notes to Unaudited Condensed Consolidated Financial Statements, and as a result of the material weakness described below, our management, including our Chief Executive Officer and Chief Financial Officer, concluded that as of June 30, 2013 our disclosure controls and procedures were not effective in providing reasonable assurance that information required to be disclosed by us in the reports filed or submitted by us under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our company’s management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

30

We identified a material weakness in our internal control over financial reporting with respect to the controls related to the preparation and review of our statement of cash flows. A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the annual or interim financial statements will not be prevented or detected on a timely basis.

As a result of this material weakness, our management also concluded that as of June 30, 2013, we did not maintain effective internal control over financial reporting.

To address this material weakness, we are undertaking improvements to our procedures and controls that will include the use of automated systems reporting of non-cash accruals related to our investment in multi-client data library and fixed assets and an improved cross-functional management review of our statement of cash flows. While we believe that the steps we are undertaking will sufficiently address this material weakness in internal control over financial reporting, there can be no assurance that the measures that we are undertaking will be adequate.

Changes in Internal Control over Financial Reporting. There was not any change in our internal control over financial reporting that occurred during the three months ended June 30, 2013, which has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 6.Exhibits

31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a).
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a).
32.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. §1350.
32.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. §1350.
101	The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Condensed Consolidated Balance Sheets at June 30, 2013 and December 31, 2012, (ii) Condensed Consolidated Statements of Operations for the three- and six-months ended June 30, 2013 and 2012, (iii) Condensed Consolidated Statements of Comprehensive Income (Loss) for the three- and six-months ended June 30, 2013 and 2012, (iv) Condensed Consolidated Statements of Cash Flows for the six-months ended June 30, 2013 (Restated) and 2012, and (v) Notes to Unaudited Condensed Consolidated Financial Statements.*
*	In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to this Quarterly Report on Form 10-Q is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, is deemed not filed for purposes of section 18 of the Exchange Act, and otherwise is not subject to liability under these sections.

32

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ION GEOPHYSICAL CORPORATION
By	/s/ Gregory J. Heinlein
	Gregory J. Heinlein
	Senior Vice President and Chief Financial Officer

Date: November 15, 2013

33

EXHIBIT INDEX

Exhibit No.	Description
31.1	Certification of Chief Executive Officer Pursuant to Rule 13a-14(a).
31.2	Certification of Chief Financial Officer Pursuant to Rule 13a-14(a).
32.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. §1350.
32.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. §1350.
101	The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Condensed Consolidated Balance Sheets at June 30, 2013 and December 31, 2012, (ii) Condensed Consolidated Statements of Operations for the three- and six-months ended June 30, 2013 and 2012, (iii) Condensed Consolidated Statements of Comprehensive Income (Loss) for the three- and six-months ended June 30, 2013 and 2012, (iv) Condensed Consolidated Statements of Cash Flows for the six-months ended June 30, 2013 (Restated) and 2012, and (v) Notes to Unaudited Condensed Consolidated Financial Statements.*
*	In accordance with Rule 406T of Regulation S-T, the XBRL-related information in Exhibit 101 to this Quarterly Report on Form 10-Q is deemed not filed or part of a registration statement or prospectus for purposes of sections 11 or 12 of the Securities Act, is deemed not filed for purposes of section 18 of the Exchange Act, and otherwise is not subject to liability under these sections.

34

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) OR RULE 15d-14(a)

I, R. Brian Hanson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q/A for the period ended June 30, 2013, of ION Geophysical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 15, 2013	/s/ R. Brian Hanson
	R. Brian Hanson
	President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a) OR RULE 15d-14(a)

I, Gregory J. Heinlein, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q/A for the period ended June 30, 2013, of ION Geophysical Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 15, 2013	/s/ Gregory J. Heinlein
	Gregory J. Heinlein
	Senior Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. §1350

In connection with the Quarterly Report of ION Geophysical Corporation (the “Company”) on Form 10-Q/A for the period ended June 30, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, R. Brian Hanson, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 15, 2013	/s/ R. Brian Hanson
	R. Brian Hanson
	President and Chief Executive Officer

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. §1350

In connection with the Quarterly Report of ION Geophysical Corporation (the “Company”) on Form 10-Q/A for the period ended June 30, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gregory J. Heinlein, Senior Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 15, 2013	/s/ Gregory J. Heinlein
	Gregory J. Heinlein
	Senior Vice President and Chief Financial Officer

XML

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

A summary of changes in accumulated other comprehensive income (loss) by component is as follows (in thousands):

	Foreign currency translation adjustments			Equity interest in investees’ other comprehensive income (loss)			Unrealized income (loss) on available-for-sale securities				Other changes in other comprehensive income (loss)				Total
Accumulated other comprehensive income (loss) at December 31, 2012	$	(12,638	)	$	1,214		$	(305	)		$	(157	)		$	(11,886	)
Other comprehensive income (loss) before reclassifications	(3,044		)	(549		)	177				—				(3,416		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			—			99			(1)	79			(2)	178
Net current-period other comprehensive income (loss)	(3,044		)	(549		)	276				79				(3,238		)
Accumulated other comprehensive income (loss) at June 30, 2013	$	(15,682	)	$	665		$	(29	)		$	(78	)		$	(15,124	)

(1)	Previously unrealized income (loss) on available-for-sale securities now recognized in other income (expense), net on the Condensed Consolidated Statement of Operations
(2)	Items previously recognized in other changes in other comprehensive income (loss) now recognized in interest expense on the Condensed Consolidated Statement of Operations

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Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Service revenues	$ 89,603	$ 72,844	$ 179,552	$ 139,478
Product revenues	31,312	32,370	71,100	77,446
Total net revenues	120,915	105,214	250,652	216,924
Cost of services	66,965	43,321	136,238	90,727
Cost of products	17,332	15,950	42,839	39,098
Gross profit	36,618	45,943	71,575	87,099
Operating expenses:
Research, development and engineering	9,087	10,306	18,377	18,032
Marketing and sales	8,968	8,654	16,948	16,071
General and administrative	11,793	14,011	27,557	28,381
Total operating expenses	29,848	32,971	62,882	62,484
Income from operations	6,770	12,972	8,693	24,615
Interest expense, net	(2,756)	(1,364)	(3,822)	(2,882)
Equity in earnings of investments	(6,338)	3,777	(5,222)	6,245
Other income (expense)	(107,118)	895	(106,091)	209
Income before income taxes	(109,442)	16,280	(106,442)	28,187
Income tax expense	(38,705)	4,184	(37,504)	7,629
Net income	(70,737)	12,096	(68,938)	20,558
Net income attributable to noncontrolling interest	(59)	281	17	394
Net income attributable to ION	(70,796)	12,377	(68,921)	20,952
Preferred stock dividends	338	338	676	676
Net income applicable to common shares	$ (71,134)	$ 12,039	$ (69,597)	$ 20,276
Net income per share:
Basic	$ (0.45)	$ 0.08	$ (0.44)	$ 0.13
Diluted	$ (0.45)	$ 0.08	$ (0.44)	$ 0.13
Weighted average number of common shares outstanding:
Basic	156,910	155,631	156,689	155,587
Diluted	156,910	162,575	156,689	162,594

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Net Income per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Net Income per Share

Net Income (Loss) per Share

Basic net income (loss) per common share is computed by dividing net income (loss) applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is determined based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issued or reserved for future issuance under outstanding stock options at June 30, 2013 and 2012 was 7,313,250 and 6,745,354, respectively, and the total number of shares of restricted stock and shares reserved for restricted stock units outstanding at June 30, 2013 and 2012 was 989,354 and 837,104, respectively.

As of June 30, 2013, there are 27,000 outstanding shares of the Company’s Series D Cumulative Convertible Preferred Stock (“Series D Preferred Stock”), which may currently be converted, at the holder’s election, into up to 6,065,075 shares of the Company’s common stock. The effects of the dilutive stock awards and the outstanding shares of Series D Preferred Stock were anti-dilutive for three and six months ended June 30, 2013.

The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Net income (loss) applicable to common shares	$	(71,134	)	$	12,039	$	(69,597	)	$	20,276
Income impact of assumed Series D Preferred Stock conversion	—			338		—			676
Net income (loss) after assumed Series D Preferred Stock conversion	$	(71,134	)	$	12,377	$	(69,597	)	$	20,952
Weighted average number of common shares outstanding	156,910			155,631		156,689			155,587
Effect of dilutive stock awards	—			879		—			942
Effect of convertible preferred stock	—			6,065		—			6,065
Weighted average number of diluted common shares outstanding	156,910			162,575		156,689			162,594
Basic net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13
Diluted net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

The following table provides additional information related to assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012. The reference to level within the table relates to the level of inputs used to determine fair value, which the key inputs are then described below. The table is as follows (amounts in thousands):

	Level 1		Level 2		Level 3
As of June 30, 2013:
Investment in convertible note	$	—	$	—	$	3,972
As of December 31, 2012:
Investment in convertible notes	—		—		8,195

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Supplemental Cash Flow Information and Non-Cash Activity Supplemental Cash Flow Information and Non-Cash Activity

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information and Non-cash Activity

Supplemental Cash Flow Information and Non-cash Activity

A summary of non-cash items from investing and financing activities is as follows (in thousands):

	Six Months Ended June 30,
	2013		2012
Purchases of computer equipment financed through capital leases	$	2,465	$	2,953
Leasehold improvement paid by landlord	$	1,738	$	—
Conversion of investment in a convertible note to equity	$	6,765	$	—
Transfer of inventory to seismic rental equipment	$	—	$	6,053

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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended	6 Months Ended				0 Months Ended
	Apr. 25, 2013	Jun. 30, 2013 BGP Joint Venture [Member]	Jun. 30, 2013 BGP Joint Venture [Member]	Jun. 30, 2012 BGP Joint Venture [Member]	Jun. 30, 2013 GeoRXT [Member]	Feb. 19, 2013 GeoRXT [Member]	Jul. 22, 2013 Subsequent Event [Member] INOVA Geophysical [Member]	Jul. 02, 2013 Subsequent Event [Member] INOVA Geophysical [Member]
Property Subject to or Available for Operating Lease [Line Items]
Basis pread on annual rate of loan								6.50%
Company's outstanding common stock owned by BGP		15.20%	15.20%
Related party transaction, revenues from transactions with related party			$ 2.9	$ 10.2
Receivables due from BGP		2.7	2.7
Paid to related party for seismic acquisition services		33.5			6.8
Owed to related party for unpaid services		10.9	10.9
Percentage of equity method investment	16.00%					30.00%
Loan made to equity method investee								10
Payments for Advance to Affiliate							$ 5	$ 5

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Long-term Debt Redemption Percentages for Future Periods (Details)	6 Months Ended
	Jun. 30, 2013
2015
Debt Instrument Redemption [Line Items]
Notes redemption percentages	104.062%
2016
Debt Instrument Redemption [Line Items]
Notes redemption percentages	102.031%
2017 and thereafter
Debt Instrument Redemption [Line Items]
Notes redemption percentages	100.00%

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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss)

A summary of changes in accumulated other comprehensive income (loss) by component is as follows (in thousands):

	Foreign currency translation adjustments			Equity interest in investees’ other comprehensive income (loss)			Unrealized income (loss) on available-for-sale securities				Other changes in other comprehensive income (loss)				Total
Accumulated other comprehensive income (loss) at December 31, 2012	$	(12,638	)	$	1,214		$	(305	)		$	(157	)		$	(11,886	)
Other comprehensive income (loss) before reclassifications	(3,044		)	(549		)	177				—				(3,416		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			—			99			(1)	79			(2)	178
Net current-period other comprehensive income (loss)	(3,044		)	(549		)	276				79				(3,238		)
Accumulated other comprehensive income (loss) at June 30, 2013	$	(15,682	)	$	665		$	(29	)		$	(78	)		$	(15,124	)

(1)	Previously unrealized income (loss) on available-for-sale securities now recognized in other income (expense), net on the Condensed Consolidated Statement of Operations
(2)	Items previously recognized in other changes in other comprehensive income (loss) now recognized in interest expense on the Condensed Consolidated Statement of Operations

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Details of Selected Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Inventories

A summary of inventories is as follows (in thousands):	June 30, 2013			December 31, 2012
Raw materials and subassemblies	$	52,881		$	49,421
Work-in-process	10,110			8,613
Finished goods	31,173			26,880
Reserve for excess and obsolete inventories	(14,669		)	(14,239		)
Total	$	79,495		$	70,675

Summary of Other Long-term Liabilities

A summary of other long-term liabilities is as follows (in thousands):	June 30, 2013		December 31, 2012
Accrual for loss contingency related to legal proceedings	$	120,000	$	—
Facility restructuring accrual	4,702		5,073
Other long-term liabilities	7,637		3,058
Total	$	132,339	$	8,131

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Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			$ (11,886)
Other comprehensive income (loss) before reclassifications			(3,416)
Amounts reclassified from accumulated other comprehensive income (loss)			178
Net current-period other comprehensive income (loss)	418	(1,667)	(3,238)		1,417
Accumulated other comprehensive income (loss), ending balance	(15,124)		(15,124)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(12,638)
Other comprehensive income (loss) before reclassifications			(3,044)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Net current-period other comprehensive income (loss)			(3,044)
Accumulated other comprehensive income (loss), ending balance	(15,682)		(15,682)
Accumulated Equity Interest in Investees' Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			1,214
Other comprehensive income (loss) before reclassifications			(549)
Amounts reclassified from accumulated other comprehensive income (loss)			0
Net current-period other comprehensive income (loss)			(549)
Accumulated other comprehensive income (loss), ending balance	665		665
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(305)
Other comprehensive income (loss) before reclassifications			177
Amounts reclassified from accumulated other comprehensive income (loss)			99	[1]
Net current-period other comprehensive income (loss)			276
Accumulated other comprehensive income (loss), ending balance	(29)		(29)
Accumulated Other Changes Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning balance			(157)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			79	[2]
Net current-period other comprehensive income (loss)			79
Accumulated other comprehensive income (loss), ending balance	$ (78)		$ (78)

[1] Unrealized income (loss) on available-for-sale securities affected Other income (expense), net on the Condensed ConsolidatedStatement of Operations

[2] Other changes in other comprehensive income affected Interest expense and Tax expense on the Condensed Consolidated Statement of Operations

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Narrative (Details)	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Number of shares issued or committed for issuance under outstanding stock options	7,313,250	6,745,354
Number of shares of restricted stock and shares reserved for restricted stock units outstanding	989,354	837,104
Number of outstanding shares of Series D Cumulative Convertible Preferred Stock	27,000
Number of shares of common stock	6,065,075

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Fair Value of Financial Instruments Assets Measured on Recurring Basis (Details) (Convertible Debt Securities [Member], Recurring Basis [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Level 1 [Member]
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale investments, fair value	$ 0	$ 0
Level 2 [Member]
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale investments, fair value	0	0
Level 3 [Member]
Assets and liabilities measured at fair value on a recurring basis
Available-for-sale investments, fair value	$ 3,972	$ 8,195

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Equity Method Investments Changes in Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity			$ 73,925
Investment in equity			1,500
Notes receivable			8,000
Equity in losses of investments	(6,338)	3,777	(5,222)	6,245
Equity interest in investees' other comprehensive income (loss)			(549)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	77,654		77,654
INOVA Geophysical [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity			73,925
Investment in equity			0
Notes receivable			0
Equity in losses of investments	(4,700)	3,777	(2,876)	6,245
Equity interest in investees' other comprehensive income (loss)			(549)
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	70,500		70,500
GeoRXT [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity			0
Investment in equity			1,500
Notes receivable			8,000
Equity in losses of investments	(1,600)		(2,346)
Equity interest in investees' other comprehensive income (loss)			0
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 7,154		$ 7,154

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Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Income and Expenses [Abstract]
Accrual for loss contingency related to legal proceedings (Note 8)	$ (110,000)	$ 0	$ (110,000)	$ 0
Gain on sale of investment	3,591	0	3,591	0
Other income (expense)	(709)	895	318	209
Total other income (expense)	$ (107,118)	$ 895	$ (106,091)	$ 209

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Other Income (Expense) (Tables)

6 Months Ended

Jun. 30, 2013

Other Income and Expenses [Abstract]

Summary of Other Income (Expense)

A summary of other income (expense) is as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Accrual for loss contingency related to legal proceedings (Note 8)	$	(110,000	)	$	—	$	(110,000	)	$	—
Gain on sale of investment	3,591			—		3,591			—
Other income (expense)	(709		)	895		318			209
Total other income (expense)	$	(107,118	)	$	895	$	(106,091	)	$	209

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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ (68,938)	$ 20,558
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization (other than multi-client library)	8,302	6,825
Amortization of multi-client library	36,679	38,918
Stock-based compensation expense	3,831	2,992
Equity in (earnings) losses of investments	5,222	(6,245)
Gain on sale of cost-method investment	(3,591)	0
Accrual for loss contingency related to legal proceedings	110,000	0
Deferred income taxes	(48,627)	(2,225)
Change in operating assets and liabilities:
Accounts receivable	34,259	61,701
Unbilled receivables	(9,160)	(32,300)
Inventories	(8,993)	(5,447)
Accounts payable, accrued expenses and accrued royalties	(11,391)	9,041
Deferred revenue	(8,242)	(6,176)
Other assets and liabilities	4,026	(1,912)
Net cash provided by operating activities	43,377	85,730
Cash flows from investing activities:
Investment in multi-client data library	(48,599)	(52,581)
Purchase of property, plant and equipment	(8,963)	(4,890)
Investment in seismic rental equipment	0	(1,384)
Investment in and advances to GeoRXT	(9,500)	0
Proceeds from sale of investment	4,150	0
Maturity of short-term investments	0	20,000
Investment in convertible note	(2,000)	(1,000)
Other investing activities	76	0
Net cash used in investing activities	(64,836)	(39,855)
Cash flows from financing activities:
Proceeds from issuance of notes	175,000	0
Payments under amended revolving line of credit	(97,250)	(1,000)
Borrowings under amended revolving line of credit	0	98,250
Repayment of term loan	0	(98,250)
Payments on long-term debt	(1,815)	(2,081)
Cost associated with issuance of notes	(6,731)	0
Cost associated with debt amendment	0	(1,313)
Payment of preferred dividends	(676)	(676)
Proceeds from exercise of stock options	1,972	317
Other financing activities	302	(101)
Net cash used in provided by financing activities	70,802	(4,854)
Effect of change in foreign currency exchange rates on cash and cash equivalents	(813)	(141)
Net increase (decrease) in cash and cash equivalents	48,530	40,880
Cash and cash equivalents at beginning of period	60,971	42,402
Cash and cash equivalents at end of period	$ 109,501	$ 83,282

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Segment Information

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates through three business segments – Solutions, Systems and Software. In addition, the Company has a 49% ownership interest in its INOVA Geophysical joint venture. The Company measures segment operating results based on income from operations. See Note 3 “Equity Method Investments” for the summarized financial information for INOVA Geophysical.

A summary of segment information is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net revenues:
Solutions:
New Venture	$	33,249	$	21,544	$	81,685	$	50,538
Data Library	21,521		22,235		30,969		32,503
Total multi-client revenues	54,770		43,779		112,654		83,041
Data Processing	33,849		28,190		65,135		55,055
Total	$	88,619	$	71,969	$	177,789	$	138,096
Systems:
Towed Streamer	$	12,570	$	13,727	$	26,119	$	29,531
Ocean Bottom	383		1,616		7,148		5,135
Other	10,895		7,476		22,428		24,859
Total	$	23,848	$	22,819	$	55,695	$	59,525
Software:
Software Systems	$	7,464	$	9,551	$	15,405	$	17,921
Services	984		875		1,763		1,382
Total	$	8,448	$	10,426	$	17,168	$	19,303
Total	$	120,915	$	105,214	$	250,652	$	216,924
Gross profit:
Solutions	$	21,890	$	28,904	$	42,087	$	47,889
Systems	8,802		9,234		17,182		25,046
Software	5,926		7,805		12,306		14,164
Total	$	36,618	$	45,943	$	71,575	$	87,099

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Gross margin:
Solutions	25		%	40		%	24		%	35		%
Systems	37		%	40		%	31		%	42		%
Software	70		%	75		%	72		%	73		%
Total	30		%	44		%	29		%	40		%
Income from operations:
Solutions	$	11,021		$	17,434		$	18,378		$	27,040
Systems	1,504			995			2,438			9,735
Software	4,955			6,879			10,116			12,361
Corporate and other	(10,710		)	(12,336		)	(22,239		)	(24,521		)
Income from operations	6,770			12,972			8,693			24,615
Interest expense, net	(2,756		)	(1,364		)	(3,822		)	(2,882		)
Equity in earnings (losses) of investments	(6,338		)	3,777			(5,222		)	6,245
Other income (expense), net	(107,118		)	895			(106,091		)	209
Income (loss) before income taxes	$	(109,442	)	$	16,280		$	(106,442	)	$	28,187

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Long-term Debt

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Long-term Debt

Long-term Debt

Obligations (in thousands)	June 30, 2013			December 31, 2012
Senior secured second-priority notes	$	175,000		$	—
Revolving line of credit	—			97,250
Facility lease obligation	1,936			2,334
Equipment capital leases	6,771			5,744
Total	183,707			105,328
Current portion of long-term debt and lease obligations	(4,388		)	(3,496		)
Non-current portion of long-term debt and lease obligations	$	179,319		$	101,832

Senior Secured Second-Priority Notes

On May 13, 2013, the Company sold $175 million aggregate principal amount of 8.125% Senior Secured Second-Priority Notes due 2018 (“Notes”) in a private offering pursuant to an Indenture dated as of May 13, 2013.  The Notes are senior secured second-priority obligations of the Company, are guaranteed by certain of the Company’s U.S. subsidiaries, and mature on May 15, 2018.  Interest on the Notes accrues at the rate of 8.125% per annum and will be payable semiannually in arrears on May 15 and November 15, commencing on November 15, 2013.

On or after May 15, 2015, the Company may on one or more occasions redeem all or a part of the Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Notes redeemed during the twelve-month period beginning on May 15th of the years indicated below:

Date	Percentage
2015	104.063	%
2016	102.031	%
2017 and thereafter	100.000	%

The Notes are initially jointly and severally guaranteed on a senior secured basis by each of the Company’s current material U.S. subsidiaries: GX Technology Corporation, ION Exploration Production (U.S.A.), Inc. and I/O Marine Systems, Inc. (the “Notes Guarantors”). The Notes and the guarantees are secured, subject to certain exceptions and permitted liens, by second-priority liens on substantially all of the assets that secure the indebtedness under the Company's senior first-priority secured credit facility with China Merchants Bank Co., Ltd., New York Branch (“CMB”) as administrative agent and lender under the facility (see “- Revolving Line of Credit” below). The indebtedness under the Notes is effectively junior to the Company's obligations under the senior secured credit facility to the extent of the value of the collateral securing the facility, and to any other indebtedness secured on a first-priority basis to the extent of the value of the Company's assets subject to those first-priority security interests.

The Company used the net proceeds from the offering to repay outstanding indebtedness under its senior secured credit facility with CMB and for general corporate purposes, including for potential additional capital contributions to GeoRXT. The Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or applicable state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws.

The Notes contain certain covenants that, among other things, limit the Company’s ability and the ability of its restricted subsidiaries to:

• Make certain investments; pay certain dividends or distributions on the capital stock or other equity interests of the Company or any restricted subsidiary; purchase, redeem or retire capital stock or certain indebtedness or make other types of restricted payments, unless

• No default under the Indenture has occurred or would occur as a result of such payment or investment,

• The Company would, after giving pro forma effect to such investment or payment, have been permitted to incur at least $1.00 of additional indebtedness under a Fixed Charge Coverage Ratio test under the Indenture and

• The aggregate cumulative amount of all such payments or investments would not exceed a sum calculated by reference to, among other items, the Company's consolidated net income, proceeds from certain sales of equity or assets, certain conversions or exchanges of debt for equity and certain other reductions in indebtedness;

• Incur additional indebtedness or issue certain preferred stock, unless the Fixed Charge Coverage Ratio for the four most recently completed fiscal quarters immediately prior to such incurrence or issuance would have been 2.0 to 1.0, as determined on a pro forma basis as if the debt had been incurred or the stock issued at the beginning of such four-quarter period;

• Create, incur or assume any lien, except certain permitted liens;

• Restrict or encumber the ability of any restricted subsidiary to (i) pay dividends on or make any other distributions with respect to its equity interests, (ii) pay indebtedness owed to the Company or any restricted subsidiary, (iii) make loans or advances to the Company or any of its restricted subsidiaries or (iv) sell, lease or transfer properties or assets to the Company or any restricted subsidiary;

• Carry out certain mergers or consolidations with another entity, or sell, assign or lease all or substantially all of the properties or assets of the Company and its Restricted Subsidiaries, taken as a whole, unless

• No default under the Indenture has occurred or would occur as a result of such merger or sale, and

• The Fixed Charge Coverage Ratio of the Company or its successor for the four most recently completed fiscal quarters immediately prior to such merger or sale would have been 2.0 to 1.0, as determined on a pro forma basis as if the merger or sale and any related financing transactions had occurred at the beginning of such four-quarter period, which would permit the Company or its successor to incur additional indebtedness under the Indenture;

• Create unrestricted subsidiaries; or

• Enter into certain transactions with affiliates of the Company.

These and other restrictive covenants contained in the Indenture are subject to important exceptions and qualifications.All of the Company's subsidiaries are currently restricted subsidiaries.

As of June 30, 2013, the Company was in compliance with these covenants.

In connection with the offering of the Notes, the Company entered into a consent agreement with CMB as administrative agent and lender under the Company’s senior secured credit facility. See “— Revolving Line of Credit” below.

In connection with the issuance of the Notes, the Company and the Notes Guarantors entered into a second lien intercreditor agreement dated as of May 13, 2013 (the “Intercreditor Agreement”) with, among others, CMB, as administrative agent, first lien representative for the first lien secured parties and collateral agent for the first lien secured parties, the trustee under the Indenture and the collateral agent for the second lien secured parties. The Intercreditor Agreement provides, among other things, that the liens on the collateral securing the Notes and related obligations will be junior and subordinate in all respects to the liens on the collateral securing the Company's senior secured credit facility and related obligations.

Revolving Line of Credit

On May 29, 2012, the Company amended the terms of its senior secured credit facility (the “Credit Facility”) with CMB, as administrative agent and lender. The First Amendment to the Credit Agreement and Loan Documents (the “First Amendment”) modified certain provisions of the Company’s senior credit agreement with CMB that it had entered into on March 25, 2010. The maturity date of any outstanding debt under the Credit Facility remains March 24, 2015.

As amended by the First Amendment, the Credit Facility provides that the Company may make revolving credit borrowings in U.S. Dollars, Euros, British Pounds Sterling or Canadian Dollars up to an amount not to exceed the U.S. Dollar equivalent of $175.0 million. The Company also agreed that no additional borrowings may be made at any time at which the outstanding indebtedness under the revolving line of credit (principal, accrued interest and fees) exceeds the U.S. Dollar equivalent of $175.0 million. The First Amendment eliminated sub-facility limits under the Credit Facility.

The Company’s obligations under the Credit Facility continue to be guaranteed by certain of its material U.S. subsidiaries that remain as parties to the Credit Facility. In addition, INOVA Geophysical continues to provide a bank stand-by letter of credit as credit support for the Company’s obligations under the Credit Facility. The Company also entered into a credit support agreement with INOVA Geophysical whereby the Company has agreed to indemnify INOVA Geophysical for any and all losses sustained by INOVA Geophysical that arise out of INOVA Geophysical’s guarantee.

As amended by the First Amendment, the interest rates per annum on borrowings under the Credit Facility are, at the Company’s option:

• an alternate base rate equal to the sum of (i) the greatest of (a) the prime rate of CMB, (b) a federal funds effective rate plus 0.50%, or (c) an adjusted LIBOR-based rate plus 1.0%, and (ii) an applicable interest margin of 1.4% (reduced from 2.5%); or

• for eurodollar borrowings and borrowings in Euros, Pounds Sterling or Canadian Dollars, the sum of (i) an adjusted LIBOR-based rate, and (ii) an applicable interest margin of 2.4% (reduced from 3.5%).

As of June 30, 2013, no borrowed amounts were outstanding under the Credit Facility.

The Credit Facility contains covenants that restrict the Company, subject to certain exceptions, from:

• incurring additional indebtedness (including certain capital lease obligations), granting or incurring additional liens on the Company's properties, pledging shares of the Company's subsidiaries, entering into certain merger or other change-in-control transactions, entering into certain transactions with the Company's affiliates, making certain sales or other dispositions of assets, making certain investments, acquiring other businesses and entering into sale-leaseback transactions with respect to the Company's properties;

• paying cash dividends on the Company's common stock; and     

• repurchasing and acquiring the Company's capital stock, unless there is no event of default under the Credit Facility and the amount of such repurchases does not exceed an amount equal to (i) 25% of the Company's consolidated net income for the prior fiscal year, less (ii) the amount of any cash dividends paid on the Company's common stock.

The Credit Facility requires compliance with certain financial covenants, including the following:

• maintain a minimum fixed charge coverage ratio, as defined, in an amount equal to at least 1.125 to 1;

• not exceed a maximum leverage ratio, as defined, of 3.25 to 1; and

• maintain a minimum tangible net worth of at least 60% of the Company’s tangible net worth as of March 31, 2010, as defined.

The fixed charge coverage ratio is defined as the ratio of (i) the Company's consolidated EBITDA, as defined in the Credit Facility, less cash income tax expense, non-financed capital expenditures and capitalized research and development costs to (ii) the sum of scheduled payments of lease payments and payments of principal indebtedness, interest expense actually paid and cash dividends, in each case for the four consecutive fiscal quarters most recently ended. The leverage ratio is defined as the ratio of (x) total funded consolidated debt, capital lease obligations and issued letters of credit (net of cash collateral) to (y) the Company's consolidated EBITDA for the four consecutive fiscal quarters most recently ended.

The Credit Facility contains customary event of default provisions, including a “change of control” event, the occurrence of which could lead to an acceleration of the Company's obligations under the Credit Facility. The Credit Facility also provides that certain acts of bankruptcy, insolvency or liquidation of INOVA Geophysical or BGP, Inc., China National Petroleum Corporation (“BGP”) would constitute additional events of default under the Credit Facility.

As of June 30, 2013, the Company was in compliance with these financial covenants and the Company expects to remain in compliance with these financial covenants for at least the next 12 months.

In connection with the Company’s offering of the Notes, on April 12, 2013, the Company, the Notes Guarantors and CMB, as administrative agent and lender under the Credit Facility, entered into a consent agreement related to the Credit Facility that permitted the Company and the Notes Guarantors to, among other things, (i) issue the Notes and related guarantees and (ii) invest a cumulative aggregate amount of up to $100 million in GeoRXT from and after February 26, 2013.

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Equity Method Investments

6 Months Ended

Jun. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

Equity Method Investments

The following table reflects the change in the Company’s equity method investments and note receivable from equity method investees during the six months ended June 30, 2013 (in thousands):

	INOVA Geophysical			GeoRXT			Total
Investment at December 31, 2012	$	73,925		$	—		$	73,925
Investment in equity	—			1,500			1,500
Note receivable	—			8,000			8,000
Equity in losses of investments	(2,876		)	(2,346		)	(5,222		)
Equity interest in investees' other comprehensive income (loss)	(549		)	—			(549		)
Investments at June 30, 2013	$	70,500		$	7,154		$	77,654

GeoRXT — In late February 2013, the Company purchased from Reservoir Exploration Technology ASA its 30% interest in a joint venture entity, GeoRXT B.V. (“GeoRXT”), for $1.5 million. GeoRXT is headquartered in Rio de Janeiro, Brazil, and specializes in seismic acquisition operations using ocean-bottom cables deployed from vessels leased by GeoRXT. The Company was granted an option, exercisable at any time on or prior to May 15, 2013, to increase its ownership percentage to 50%, which would have required making additional capital contributions to GeoRXT of $40.0 million. Additionally, the Company provided GeoRXT with an $8.0 million working capital loan, the repayment of which is guaranteed by the Company’s majority joint venture partner in GeoRXT, Georadar Levantamentos Geofisicos S/A (“Georadar”). The stated maturity date of the loan was May 25, 2013. The Company continues to perform a due diligence review of GeoRXT and has not yet increased its ownership interest in GeoRXT to a 50% equity interest. If the Company increases its ownership interest, a portion of the Company’s required capital contribution to GeoRXT for the additional equity interest would likely be effectively funded through the conversion of the loan into equity. As a result, the Company has elected to allow this loan to remain outstanding until the Company decides whether to increase its ownership interest.

The Company accounts for its interest in GeoRXT on a current basis; its shares of losses in GeoRXT for the three months and six months ended June 30, 2013 were $1.6 million and $2.3 million, respectively. The Company’s share of losses for the three months ended June 30, 2013 would have effectively reduced its equity method investment in GeoRXT to less than zero. Therefore, the Company reduced its equity method investment to zero and recorded its share of additional losses, totaling $0.8 million, to reduce the carrying value of the note receivable from GeoRXT. The following table reflects the summarized financial information for GeoRXT for the three months ended June 30, 2013 and the period from March 1 to June 30, 2013 (in thousands):

	Three Months Ended June 30, 2013			Period from March 1 to June 30, 2013
Net revenues	$	13,698		$	19,668
Gross profit	$	(195	)	$	122
Loss from operations	$	(5,107	)	$	(6,876	)
Net loss	$	(5,151	)	$	(7,045	)

INOVA Geophysical — The Company accounts for its 49% interest in INOVA Geophysical as an equity method investment and records its share of earnings and losses of INOVA Geophysical on a one fiscal quarter lag basis. For the three and six months ended June 30, 2013, the Company recorded its share of losses from INOVA Geophysical of $(4.7) million and $(2.9) million, respectively, compared to equity earnings in the same periods one year ago of $3.8 million and $6.2 million, respectively. The following table reflects the summarized financial information for INOVA Geophysical for the three months ended March 31, 2013 and 2012 and the six-month periods from October 1 to March 31 of 2013 and 2012 (in thousands):

	Three months ended March 31,					Six-Month Period from October 1 through March 31
	2013			2012		2013			2012
Net revenues	$	22,095		$	56,779	$	81,706		$	115,777
Gross profit	$	1,808		$	19,502	$	14,135		$	33,466
Income (loss) from operations	$	(8,511	)	$	8,910	$	(8,761	)	$	15,419
Net income (loss)	$	(9,772	)	$	8,654	$	(6,030	)	$	14,371

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Fair Value of Financial Instruments Narrative (Details) (USD $)	0 Months Ended	1 Months Ended			6 Months Ended
	Apr. 25, 2013	Mar. 31, 2012	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Convertible Debt Securities [Member]	Jun. 30, 2013 Credit Facility Receivable [Member]
Fair Value of Financial Instruments (Textual) [Abstract]
Carrying value of long-term debt			$ 183,707,000	$ 105,328,000
Fair value of long-term debt			173,200,000	105,300,000
Fair Value of Financial Instruments (Additional Textual) [Abstract]
Principal amount of convertible note					6,500,000
Interest rate on convertible note					4.00%
Number of common shares note receivable converted into	1,533,858
Post-conversion equity ownership percentage in investee	16.00%
Note and accrued interest, fair value	6,900,000
Note and accrued interest, carrying value	7,000,000
Realized loss on convertible note prior to conversion	(100,000)
Credit facility to investee		4,000,000
Amount drawn on credit facility by investee					$ 4,000,000	$ 4,000,000

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Supplemental Cash Flow Information and Non-Cash Activity (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Summary of Non-cash Items from Investing and Financing Activities

A summary of non-cash items from investing and financing activities is as follows (in thousands):

	Six Months Ended June 30,
	2013		2012
Purchases of computer equipment financed through capital leases	$	2,465	$	2,953
Leasehold improvement paid by landlord	$	1,738	$	—
Conversion of investment in a convertible note to equity	$	6,765	$	—
Transfer of inventory to seismic rental equipment	$	—	$	6,053

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Equity Method Investments Narrative (Details) (USD $)	3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Apr. 25, 2013	Dec. 31, 2012	Jun. 30, 2013 GeoRXT [Member]	Jun. 30, 2013 GeoRXT [Member]	Feb. 19, 2013 GeoRXT [Member]	Jun. 30, 2013 INOVA Geophysical [Member]	Jun. 30, 2012 INOVA Geophysical [Member]	Jun. 30, 2013 INOVA Geophysical [Member]	Jun. 30, 2012 INOVA Geophysical [Member]	Jun. 30, 2013 Optional Increase in Ownership [Member] GeoRXT [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity method investment					16.00%				30.00%	49.00%		49.00%		50.00%
Optional capital contribution to GeoRXT to increase ownership percentagel			$ 9,500,000	$ 0										$ 40,000,000
Amount of purchased interest in joint venture entity									1,500,000
Amount of short-term working capital loan to related party									8,000,000
Equity in losses of investments	(6,338,000)	3,777,000	(5,222,000)	6,245,000			(1,600,000)	(2,346,000)		(4,700,000)	3,777,000	(2,876,000)	6,245,000
Equity method investments	77,654,000		77,654,000			73,925,000	0	0
Equity method investments, notes receivable reduction							$ (800,000)

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Long-term Debt Narrative (Details) (USD $)		6 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended
	Feb. 26, 2013	Jun. 30, 2013 Senior Notes [Member] China Merchants Bank Co. (CMB) [Member]	May 13, 2013 Senior Notes [Member] China Merchants Bank Co. (CMB) [Member]	Mar. 31, 2010 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member]	Mar. 31, 2010 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member] Eurodollar Borrowing [Member]	Jun. 30, 2013 Revolving Credit Facility [Member] China Merchants Bank Co. (CMB) [Member] Eurodollar Borrowing [Member]
Long-term Debt and Interest Rate Caps (Textual) [Abstract]
Principal amount of debt			$ 175,000,000
Stated rate on debt			8.125%
Revolving line of credit, Maximum					175,000,000
Outstanding term loan indebtedness under Credit Facility					0
Debt instrument restrictive covenant, maximum percentage of stock to net income allowed to be repurchased					25.00%
Debt instrument basis spread on variable rate under option one					0.50%	3.50%	2.40%
Debt instrument basis spread on variable rate under option two					1.00%
Debt instrument basis spread on variable rate under option three				2.50%	1.40%
Fixed charge coverage ratio		2.0			1.125
Leverage ratio					3.25
Percentage of tangible net worth for covenants compliance				60.00%
Amount allowed by lender to invest in investee	$ 100,000,000

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Details of Selected Balance Sheet Accounts Long-term Liabilities (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Accrual for loss contingency related to legal proceedings	$ 120,000,000		$ 0
Stafford facility restructuring accrual	4,702,000		5,073,000
Other long-term liabilities	7,637,000		3,058,000
Total	132,339,000		8,131,000
Accrual for loss contingency related to legal proceedings		$ 10,000,000

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares outstanding	157,022,597	156,356,949
Treasury stock, shares	849,539	849,539

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Litigation

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Litigation

Litigation

WesternGeco

In June 2009, WesternGeco L.L.C. (“WesternGeco”) filed a lawsuit against the Company in the United States District Court for the Southern District of Texas, Houston Division. In the lawsuit, styled WesternGeco L.L.C. v. ION Geophysical Corporation, WesternGeco alleged that the Company had infringed several method and apparatus claims contained in four of its United States patents regarding marine seismic streamer steering devices. WesternGeco sought unspecified monetary damages and an injunction prohibiting the Company from making, using, selling, offering for sale or supplying any infringing products in the United States.

In June 2010, WesternGeco filed a lawsuit against various subsidiaries and affiliates of Fugro N.V. (“Fugro”), one of the Company’s seismic contractor customers, accusing Fugro of infringing the same United States patents regarding marine seismic streamer steering devices by planning to use certain equipment purchased from the Company on a survey located outside of U.S. territorial waters. The court approved the consolidation of the Fugro case with the case against the Company. Fugro filed a motion to dismiss the lawsuit, and in March 2011 the presiding judge granted Fugro’s motion to dismiss in part, on the basis that the alleged activities of Fugro would occur more than 12 miles from the U.S. coast and therefore are not actionable under U.S. patent infringement law. In response to a Motion for Summary Judgment filed jointly by the Company and Fugro, the Court ruled in April 2012 that the Company did not directly infringe WesternGeco’s method patent claims. In a pre-trial ruling on June 29, 2012, the Court ruled that, if a particular patent claim of WesternGeco was held to be valid and enforceable at the trial, the Company’s supplying of its DigiFIN^® lateral streamer control units and related software from the United States to its customers overseas with an intention for the customers to combine DigiFIN and such related software with other required components of the patent claim, would infringe one claim in one of WesternGeco’s asserted patents, U.S. Patent No. 7,293,520.

Trial began on July 23, 2012. During the trial, Fugro settled all claims asserted against it by WesternGeco and obtained a global license from WesternGeco. A verdict was returned by the jury on August 16, 2012, finding that the Company willfully infringed the claims contained in the four patents by supplying DigiFIN and the related software from the United States and awarded WesternGeco the sum of $105.9 million in damages, consisting of $12.5 million in reasonable royalty and $93.4 million in lost profits.

In September 2012, the Company filed motions with the trial court to overturn all or portions of the verdict. In June 2013, the presiding judge entered a Memorandum and Order rejecting the jury's finding of willfulness and denying WesternGeco's motions for willfulness and enhanced damages, but also denying the Company's post-verdict motions that challenged the jury's infringement findings and the damages amount. In the Memorandum and Order, the judge also stated that he would approve WesternGeco’s motion for a permanent injunction and that WesternGeco is entitled to be awarded damages for the additional DigiFIN units that were sold to customers prior to the entry of the final judgment but that were not included in the jury verdict due to the timing of the trial. The Court will likely determine supplemental damages for the additional sold DigiFIN units in a future order or a future proceeding.

The next probable step in the case is for the trial court judge to sign and enter a final judgment. As of the filing date of this Quarterly Report on Form 10-Q, the Court had not yet entered a final judgment in the case.

Upon the entering of a final judgment, the Company intends to appeal the judgment to the United States Court of Appeals for the Federal Circuit. WesternGeco would also have the right to elect to appeal any final judgment.

Either within its final judgment or in a separate order entered after its final judgment, the trial court has ruled that it will also enter a permanent injunction against the Company. As of the filing date of this Quarterly Report on Form 10-Q, the Court had not issued the terms of the permanent injunction. Until the permanent injunction is entered, the terms of the injunction cannot be known for certain, but it is likely that the permanent injunction will prohibit the Company from supplying its DigiFIN units and related software from the United States to its customers overseas with an intention for the customers to combine DigiFIN and the software with other required components of the patent claims. The Company has reorganized its operations such that it no longer supplies DigiFIN units and the related software from the United States.

Based on the Company’s analysis after the trial court’s Memorandum and Order in June 2013 denying the Company’s post-verdict motions that challenged the jury's infringement findings and the damages amount, the Company determined to increase its loss contingency accrual related to this case from $10.0 million to $120.0 million, consisting of jury verdict damages, court costs, and estimates of prejudgment interest and supplemental damages.

The Company’s assessment of its potential loss contingency may change in the future due to developments at the trial court or appellate court and other events, such as changes in applicable law, and such reassessment could lead to the determination that no loss contingency is probable or that a greater loss contingency is probable, which could have a material effect on the Company’s financial condition or results of operations.

As stated above, the Company intends to appeal the trial court judgment to the United States Court of Appeals for the Federal Circuit. In order to appeal the judgment, the Company may be required to post an appeal bond for the full amount of damages entered in the judgment. To be prepared for a possible adverse judgment in this case, the Company has arranged with sureties to post an appeal bond on its behalf if necessary. Although the terms of the appeal bond enable each surety to require the Company to post collateral with the surety at any time the bond is outstanding, for up to the full amount of the bond, each surety has represented to the Company that such a requirement would only occur in rare circumstances where the surety deems a larger amount of security is necessary. In the unlikely event that the Company is required to post collateral with a surety during the appeal process, depending on the size of the bond and the level of required collateral, in order to collateralize the bond the Company might need to utilize a combination of cash on hand, undrawn balances available under its revolving line of credit and possibly incur additional debt and/or equity financing. The collateralization of such a large appeal bond could have a possible adverse effect on the Company’s liquidity. If the Company is unable to post the appeal bond, the Company may be unable to stay enforcement of the judgment or appeal the case. At this time, the Company is unable to determine the amount of such an appeal bond or whether and to what extent the sureties may require the appeal bond to be collateralized in the future. Similarly, the Company is unable to predict the timing of the final judgment being entered by the trial court or the timing of posting any required appeal bond.

Fletcher

In November 2009, Fletcher International Ltd. (“Fletcher”), the holder of the shares of the Company’s outstanding Series D Preferred Stock until June 2012, filed a lawsuit against the Company and certain of its directors in the Delaware Court of Chancery. In the lawsuit, styled Fletcher International, Ltd. v. ION Geophysical Corporation, et al, Fletcher alleged, among other things, that the Company violated Fletcher’s consent rights contained in the Series D Preferred Stock Certificates of Designation, by (a) the execution and delivery of a convertible promissory note to the Bank of China, New York Branch by one of the Company’s subsidiaries (incorporated in Luxembourg), in connection with a bridge loan funded in October 2009 by Bank of China, and (b) a Canadian subsidiary of the Company executing and delivering several promissory notes in 2008 in connection with the Company’s acquisition of ARAM Systems Ltd., Fletcher also alleged that the Company’s directors violated their fiduciary duties by allowing the subsidiaries to deliver the notes without Fletcher’s consent. In a Memorandum Opinion issued in May 2010 in response to a motion for partial summary judgment, the judge dismissed all of Fletcher’s claims against the named Company directors but also concluded that, because the bridge loan note executed by the Company’s Luxembourg subsidiary in 2009 was convertible into the Company’s common stock, Fletcher had the right to consent to the issuance of the note and that the Company had violated Fletcher’s consent rights by that subsidiary’s issuing the note without Fletcher’s consent. In March 2011, the judge dismissed certain additional claims asserted by Fletcher. In May 2012, the judge ruled that Fletcher did not have the right to consent with respect to two promissory notes executed and delivered by the Canadian subsidiary in September 2008 in connection with the Company’s purchase of ARAM Systems Ltd., but that Fletcher did have the right to consent to the execution and delivery in December 2008 of a replacement promissory note in the principal amount of $35 million, and that the Company had violated Fletcher’s consent rights by the subsidiary’s executing and delivering the replacement promissory note without Fletcher’s consent. Fletcher has since declared to the Court that it will not pursue damages related to the issuance of the replacement $35 million promissory note.

In June 2012, Fletcher filed a voluntary petition for relief under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the Southern District of New York. Fletcher’s shares of Series D Preferred Stock, which had been pledged by Fletcher to secure certain indebtedness, were sold by the pledgee to the affiliate of D.E. Shaw & Co., Inc. in June 2012. The Company does not believe that the acquisition of the shares by such D. E. Shaw & Co., Inc. affiliate or the bankruptcy filing by Fletcher will have a material impact on Fletcher’s lawsuit against the Company. The Company believes that the monetary damages suffered by Fletcher as a result of the Company’s subsidiary executing and delivering the convertible note without Fletcher’s consent are nonexistent or nominal, and that the ultimate outcome of the lawsuit will not result in a material adverse effect on the Company’s financial condition or results of operations.

Other

The Company has been named in various other lawsuits or threatened actions that are incidental to its ordinary business. Litigation is inherently unpredictable. Any claims against the Company, whether meritorious or not, could be time-consuming, cause the Company to incur costs and expenses, require significant amounts of management time and result in the diversion of significant operational resources. The results of these lawsuits and actions cannot be predicted with certainty. Management currently believes that the ultimate resolution of these matters will not have a material adverse impact on the financial condition, results of operations or liquidity of the Company.

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ (70,737)	$ 12,096	$ (68,938)	$ 20,558
Other comprehensive income (loss), net of taxes, as appropriate:
Foreign currency translation adjustments	597	(1,503)	(3,044)	265
Equity interest in investees' other comprehensive income (loss)	(526)	369	(549)	716
Unrealized income (loss) on available-for-sale securities	245	(499)	177	463
Other changes in other comprehensive income (loss)	102	(34)	178	(27)
Total other comprehensive income (loss), net of taxes	418	(1,667)	(3,238)	1,417
Comprehensive net income (loss)	(70,319)	10,429	(72,176)	21,975
Comprehensive income attributable to noncontrolling interest	(59)	281	17	394
Comprehensive net income (loss) attributable to ION	$ (70,378)	$ 10,710	$ (72,159)	$ 22,369

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Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 109,501	$ 60,971
Accounts receivable, net	92,712	127,136
Unbilled receivables	98,944	89,784
Inventories	79,495	70,675
Prepaid expenses and other current assets	20,294	25,605
Total current assets	400,946	374,171
Deferred income tax asset	81,961	28,414
Property, plant, equipment and seismic rental equipment, net	40,001	33,772
Multi-client data library, net	227,139	230,315
Equity method investments	77,654	73,925
Goodwill	53,991	55,349
Intangible assets, net	12,992	14,841
Other assets	15,731	9,796
Total assets	910,415	820,583
Current liabilities:
Current maturities of long-term debt	4,388	3,496
Accounts payable	29,996	28,688
Accrued expenses	87,600	124,095
Accrued multi-client data library royalties	24,284	26,300
Deferred revenue	18,566	26,899
Total current liabilities	164,834	209,478
Long-term debt, net of current maturities	179,319	101,832
Other long-term liabilities	132,339	8,131
Total liabilities	476,492	319,441
Redeemable noncontrolling interest	2,229	2,123
Equity:
Cumulative convertible preferred stock	27,000	27,000
Common stock, $0.01 par value; authorized 200,000,000 shares; outstanding 157,022,597 and 156,356,949 shares at June 30, 2013 and December 31, 2012, respectively, net of treasury stock	1,570	1,564
Additional paid-in capital	853,575	848,669
Accumulated deficit	(429,218)	(360,297)
Accumulated other comprehensive loss	(15,124)	(11,886)
Treasury stock, at cost, 849,539 shares at both June 30, 2013 and December 31, 2012	(6,565)	(6,565)
Total stockholders' equity	431,238	498,485
Noncontrolling interests	456	534
Total equity	431,694	499,019
Total liabilities and equity	$ 910,415	$ 820,583

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Basis of Presentation Restatement (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Accounts payable, accrued expenses and accrued royalties	$ (11,391)	$ 9,041
Net cash provided by operating activities	43,377	85,730
Investment in multi-client data library	(48,599)	(52,581)
Net cash used in investing activities	(64,836)	(39,855)
Net increase (decrease) in cash and cash equivalents	48,530	40,880
Cash and cash equivalents at end of period	109,501	83,282	60,971	42,402
Scenario, Previously Reported [Member]
Accounts payable, accrued expenses and accrued royalties	(26,487)
Net cash provided by operating activities	28,281
Investment in multi-client data library	(33,503)
Net cash used in investing activities	(49,740)
Net increase (decrease) in cash and cash equivalents	48,530
Cash and cash equivalents at end of period	109,501
Restatement Adjustment [Member]
Accounts payable, accrued expenses and accrued royalties	15,096
Net cash provided by operating activities	15,096
Investment in multi-client data library	(15,096)
Net cash used in investing activities	(15,096)
Net increase (decrease) in cash and cash equivalents	0
Cash and cash equivalents at end of period	$ 0

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Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Obligations

Obligations (in thousands)	June 30, 2013			December 31, 2012
Senior secured second-priority notes	$	175,000		$	—
Revolving line of credit	—			97,250
Facility lease obligation	1,936			2,334
Equipment capital leases	6,771			5,744
Total	183,707			105,328
Current portion of long-term debt and lease obligations	(4,388		)	(3,496		)
Non-current portion of long-term debt and lease obligations	$	179,319		$	101,832

Debt Instrument Redemption Percentages

On or after May 15, 2015, the Company may on one or more occasions redeem all or a part of the Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Notes redeemed during the twelve-month period beginning on May 15th of the years indicated below:

Date	Percentage
2015	104.063	%
2016	102.031	%
2017 and thereafter	100.000	%

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Details of Selected Balance Sheet Accounts Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials and subassemblies	$ 52,881	$ 49,421
Work-in-process	10,110	8,613
Finished goods	31,173	26,880
Reserve for excess and obsolete inventories	(14,669)	(14,239)
Total	$ 79,495	$ 70,675

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Unreserved portion of deferred tax assets	$ 55.8		$ 55.8
Deferred tax assets related to impact of accrual for litigation	42.0		42.0
Effective income tax rates	35.40%	25.70%	35.20%	27.10%
Unrecognized tax benefits	$ 2.0		$ 2.0

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Basic and Diluted Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income applicable to common shares	$ (71,134)	$ 12,039	$ (69,597)	$ 20,276
Weighted average number of common shares outstanding	156,910	155,631	156,689	155,587
Effect of dilutive stock awards and convertible preferred stock	0	879	0	942
Effect of convertible preferred stock	0	6,065	0	6,065
Weighted average number of diluted common shares outstanding	156,910	162,575	156,689	162,594
Basic net income per share	$ (0.45)	$ 0.08	$ (0.44)	$ 0.13
Diluted net income per share	$ (0.45)	$ 0.08	$ (0.44)	$ 0.13
Series D Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income impact of assumed Series D Preferred Stock conversion	0	338	0	676
Net Income after Assumed Preferred Stock Conversion	$ (71,134)	$ 12,377	$ (69,597)	$ 20,952

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Long-term Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Obligations
Carrying value of long-term debt	$ 183,707	$ 105,328
Current portion of long-term debt and lease obligations	(4,388)	(3,496)
Non-current portion of long-term debt and lease obligations	179,319	101,832
Senior Notes [Member]
Obligations
Carrying value of long-term debt	175,000	0
Revolving Credit Facility [Member]
Obligations
Carrying value of long-term debt	0	97,250
Facility Lease Obligation [Member]
Obligations
Carrying value of long-term debt	1,936	2,334
Capital Lease Obligations [Member]
Obligations
Carrying value of long-term debt	$ 6,771	$ 5,744

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Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The Company’s financial instruments include cash and cash equivalents, accounts and unbilled receivables, notes receivable, accounts payable, accrued multi-client data library royalties, investment in a convertible note from a privately-owned U.S.-based technology company and long-term debt. The carrying amounts of cash and cash equivalents, accounts and unbilled receivables, notes receivable, accounts payable and accrued multi-client data library royalties approximate fair value due to the highly liquid nature of these instruments.

The carrying amounts of the Company’s long-term debt as of June 30, 2013 and December 31, 2012 were $183.7 million and $105.3 million, respectively, compared to its fair values of $173.2 million and $105.3 million as of June 30, 2013 and December 31, 2012, respectively. The fair value of the long-term debt was calculated using a market approach based upon Level 2 inputs, including a price quote from a major financial institution, as of June 30, 2013. As of December 31, 2012, Level 3 inputs were used, including an estimated interest rate reflecting then-current market conditions.

The following table provides additional information related to assets measured at fair value on a recurring basis at June 30, 2013 and December 31, 2012. The reference to level within the table relates to the level of inputs used to determine fair value, which the key inputs are then described below. The table is as follows (amounts in thousands):

	Level 1		Level 2		Level 3
As of June 30, 2013:
Investment in convertible note	$	—	$	—	$	3,972
As of December 31, 2012:
Investment in convertible notes	—		—		8,195

Investment in Convertible Notes. In May 2011, the Company purchased a convertible note from a privately-owned U.S.-based technology company. The original principal amount of the note is $6.5 million, and it bears interest at a rate of 4% per annum. On April 25, 2013, the Company converted the note and accrued interest into 1,533,858 common shares of the investee which resulted in a post-conversion equity ownership percentage interest in the investee of 16%. At April 25, 2013, prior to conversion, the note and accrued interest had a fair value of $6.9 million compared to a book value of $7.0 million resulting in a realized loss of $(0.1) million. The Company performed a fair value analysis with respect to its investment in the convertible note and interest using Level 3 inputs. These inputs included an income approach, using a discounted cash flow model; a market approach, using peer company multiples; as well as a market approach, including terms and likelihood of an investment event.

In March 2012, the Company and the investee entered into an agreement for the Company to make available to the investee a credit facility in an amount of up to $4.0 million. This credit facility originally had a term of one year with an option to extend its term by one year, which was agreed to by the Company and the investee effective March 16, 2013. The credit facility indebtedness now matures on March 15, 2014. The credit facility allows for conversion of the outstanding balance of the promissory note under the credit facility into common shares of the investee. As of June 30, 2013, the investee had drawn $4.0 million under this credit arrangement.

The Company performed a fair value analysis with respect to its investment in the convertible note using Level 3 inputs. These inputs included an income approach, using a discounted cash flow model; a market approach, using peer company multiples; as well as a market approach, including the terms and likelihood of an investment event. As of June 30, 2013, the fair value of this investment was approximately $4.0 million; which was equal to its carrying value.

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Summary of segment information
Revenues	$ 120,915	$ 105,214	$ 250,652	$ 216,924
Gross profit	36,618	45,943	71,575	87,099
Gross margin	30.00%	44.00%	29.00%	40.00%
Income from operations	6,770	12,972	8,693	24,615
Interest expense, net	(2,756)	(1,364)	(3,822)	(2,882)
Equity in earnings of investments	(6,338)	3,777	(5,222)	6,245
Other income (expense)	(107,118)	895	(106,091)	209
Income before income taxes	(109,442)	16,280	(106,442)	28,187
Solutions [Member]
Summary of segment information
Revenues	88,619	71,969	177,789	138,096
Gross profit	21,890	28,904	42,087	47,889
Gross margin	25.00%	40.00%	24.00%	35.00%
Income from operations	11,021	17,434	18,378	27,040
Systems [Member]
Summary of segment information
Revenues	23,848	22,819	55,695	59,525
Gross profit	8,802	9,234	17,182	25,046
Gross margin	37.00%	40.00%	31.00%	42.00%
Income from operations	1,504	995	2,438	9,735
Software [Member]
Summary of segment information
Revenues	8,448	10,426	17,168	19,303
Gross profit	5,926	7,805	12,306	14,164
Gross margin	70.00%	75.00%	72.00%	73.00%
Income from operations	4,955	6,879	10,116	12,361
Corporate and Other [Member]
Summary of segment information
Income from operations	(10,710)	(12,336)	(22,239)	(24,521)
New Venture and Data Library [Member] | Solutions [Member]
Summary of segment information
Revenues	54,770	43,779	112,654	83,041
New Venture [Member] | Solutions [Member]
Summary of segment information
Revenues	33,249	21,544	81,685	50,538
Data Library [Member] | Solutions [Member]
Summary of segment information
Revenues	21,521	22,235	30,969	32,503
Data Processing [Member] | Solutions [Member]
Summary of segment information
Revenues	33,849	28,190	65,135	55,055
Towed Streamer [Member] | Systems [Member]
Summary of segment information
Revenues	12,570	13,727	26,119	29,531
Ocean Bottom [Member] | Systems [Member]
Summary of segment information
Revenues	383	1,616	7,148	5,135
Other [Member] | Systems [Member]
Summary of segment information
Revenues	10,895	7,476	22,428	24,859
Software Systems [Member] | Software [Member]
Summary of segment information
Revenues	7,464	9,551	15,405	17,921
Services [Member] | Software [Member]
Summary of segment information
Revenues	$ 984	$ 875	$ 1,763	$ 1,382

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Litigation (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended					1 Months Ended
	Jun. 30, 2009 Patent	Jun. 30, 2009 WesternGeco [Member] Patent	Jun. 30, 2013 WesternGeco [Member]	Mar. 31, 2013 WesternGeco [Member]	May 31, 2012 Fletcher [Member]	Aug. 16, 2012 Pending Litigation [Member] WesternGeco [Member]	Aug. 16, 2012 Lost Royalties [Member] Pending Litigation [Member] WesternGeco [Member]	Aug. 16, 2012 Lost Profits [Member] Pending Litigation [Member] WesternGeco [Member]
Litigation (Textual) [Abstract]
Number of patent apparatus claims contained	4	4
Total damages awarded						$ 105.9	$ 12.5	$ 93.4
Accrual for loss contingency related to legal proceedings			120.0	10.0
Principal amount of promissory note					$ 35

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Details of Selected Balance Sheet Accounts Details of Selected Balance Sheet Accounts

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Details of Selected Balance Sheet Accounts

Details of Selected Balance Sheet Accounts

A summary of inventories is as follows (in thousands):	June 30, 2013			December 31, 2012
Raw materials and subassemblies	$	52,881		$	49,421
Work-in-process	10,110			8,613
Finished goods	31,173			26,880
Reserve for excess and obsolete inventories	(14,669		)	(14,239		)
Total	$	79,495		$	70,675

A summary of other long-term liabilities is as follows (in thousands):	June 30, 2013		December 31, 2012
Accrual for loss contingency related to legal proceedings	$	120,000	$	—
Facility restructuring accrual	4,702		5,073
Other long-term liabilities	7,637		3,058
Total	$	132,339	$	8,131

At December 31, 2012, the Company had an accrual for loss contingency related to legal proceedings of $10.0 million, which was reflected in Accrued Expenses. As of June 30, 2013, that amount was reclassified into other long-term liabilities.

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company maintains a valuation allowance for a portion of its deferred tax assets, which relate to U.S. capital losses or basis differences that will create capital losses as well as non-U.S. net operating losses. The valuation allowance is calculated in accordance with the provisions of Accounting Series Codification (“ASC”) 740 “Income Taxes,” which requires that a valuation allowance be established or maintained when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. In the event the Company's expectations of future operating results change, the valuation allowance may need to be adjusted upward or downward. As of June 30, 2013, the Company's unreserved U.S. net deferred tax assets totaled $55.8 million, including $42.0 million of deferred tax assets related to the impact of an accrual with respect to certain outstanding litigation, recorded primarily in the three months ended June 30, 2013. See Note 8 “Litigation — WesternGeco” below. These existing unreserved net deferred tax assets are currently considered to be “more likely than not” realized based on the Company’s expectations of future earnings and available tax planning strategies.

The Company's effective tax rates for the three months ended June 30, 2013 and 2012 were 35.4% and 25.7%, respectively, and for the six months ended June 30, 2013 and 2012 were 35.2% and 27.1%, respectively. The change in the Company's effective tax rate was due primarily to the tax impact of the accrual for litigation recognized during the three months ended June 30, 2013.

The total amount of the Company’s unrecognized tax benefits as of June 30, 2013 was $2.0 million. The Company accrues estimated interest and penalties, if any, related to unrecognized tax benefits as a component of the Company’s provision for income taxes.

The Company’s U.S. federal tax returns for 2007 and subsequent years remain subject to examination by tax authorities. The Company is no longer subject to IRS examination for periods prior to 2007, although carryforward attributes that were generated prior to 2007 may still be adjusted upon examination by the IRS if they either have been or will be used in an open year. In the Company’s foreign tax jurisdictions, tax returns for 2008 and subsequent years generally remain open to examination.

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Basis of Presentation

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation and Restatement

Basis of Presentation

The condensed consolidated balance sheet of ION Geophysical Corporation and its subsidiaries (collectively referred to as the “Company” or “ION,” unless the context otherwise requires) at December 31, 2012 has been derived from the Company’s audited consolidated financial statements at that date. The condensed consolidated balance sheet at June 30, 2013, and the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2013 and 2012 and the condensed consolidated statements of cash flows for the six months ended June 30, 2013 and 2012, are unaudited. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The results of operations for the three and six months ended June 30, 2013 are not necessarily indicative of the operating results for a full year or of future operations.

These condensed consolidated financial statements have been prepared using accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and applicable rules of Regulation S-X of the Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in annual financial statements presented in accordance with accounting principles generally accepted in the United States have been omitted. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 and Amendment No. 1 thereto on Form 10-K/A, which was filed on April 17, 2013 and contains the separate consolidated financial statements of INOVA Geophysical Equipment Limited (“INOVA Geophysical”) for the fiscal year ended December 31, 2012.

Restatement of the Financial Statements for the Three and Six Months Ended June 30, 2013

The condensed consolidated statement of cash flows for the six months ended June 30, 2013 has been restated. In connection with the preparation of the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, the Company determined that it had incorrectly presented certain non-cash investments in its multi-client seismic data libraries in its condensed consolidated statements of cash flows. The Company incorrectly included non-cash activity related to the investment in its multi-client seismic data libraries, which resulted in an understatement of its cash provided by operating activities and an understatement of its cash used in investing activities. Management concluded that the impact of the incorrect presentation to periods prior to 2013 was immaterial.

The consolidated financial information contained in this Form 10-Q/A for the six months ended June 30, 2013 reflects the Company’s restated statement of cash flows for this six-month period resulting in changes within cash flows from operating and investing activities, but no change to total cash and cash equivalents. The adjustments reflected in the restatement of the condensed consolidated statement of cash flows are as follows (in thousands):

	Six Months Ended June 30, 2013
	As Reported			Adjustment			As Restated
Statement of Cash Flows:
Accounts payable, accrued expenses and accrued royalties	$	(26,487	)	$	15,096		$	(11,391	)
Net cash provided by operating activities	$	28,281		$	15,096		$	43,377
Investment in multi-client data library	$	(33,503	)	$	(15,096	)	$	(48,599	)
Net cash used in investing activities	$	(49,740	)	$	(15,096	)	$	(64,836	)
Net increase in cash and cash equivalents	$	48,530		$	—		$	48,530
Cash and cash equivalents at end of period	$	109,501		$	—		$	109,501

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Supplemental Cash Flow Information and Non-Cash Activity (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental Cash Flow Elements [Abstract]
Purchases of computer equipment financed through capital leases	$ 2,465	$ 2,953
Leasehold improvement paid by landlord	1,738	0
Conversion of investment in a convertible note to equity	6,765	0
Transfer of inventory to seismic rental equipment	$ 0	$ 6,053

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Equity Method Investments Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	4 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013 GeoRXT [Member]	Jun. 30, 2013 GeoRXT [Member]	Mar. 31, 2013 INOVA Geophysical [Member]	Mar. 31, 2012 INOVA Geophysical [Member]	Mar. 31, 2013 INOVA Geophysical [Member]	Mar. 31, 2012 INOVA Geophysical [Member]
Schedule of Equity Method Investments [Line Items]
Net revenues	$ 13,698	$ 19,668	$ 22,095	$ 56,779	$ 81,706	$ 115,777
Gross profit	(195)	122	1,808	19,502	14,135	33,466
Income (loss) from operations	(5,107)	(6,876)	(8,511)	8,910	(8,761)	15,419
Net income	$ (5,151)	$ (7,045)	$ (9,772)	$ 8,654	$ (6,030)	$ 14,371

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Related Party Transactions

6 Months Ended

Jun. 30, 2013

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

BGP owned approximately 15.2% of the Company’s outstanding common stock as of June 30, 2013. For the six months ended June 30, 2013 and 2012, the Company recorded revenues from BGP of $2.9 million and $10.2 million, respectively. Total receivables due from BGP were $2.7 million at June 30, 2013. During the six months ended June 30, 2013, the Company paid to BGP $33.5 million for seismic acquisition services provided on a large 3D marine project; the Company’s accounts payable owed to BGP for those same services was $10.9 million as of June 30, 2013.

For the six months ended June 30, 2013, the Company sold equipment to GeoRXT for $6.8 million, which was due to be paid in May 2013. This receivable remained outstanding at June 30, 2013. The payment of the purchase price for this equipment is guaranteed by the Company’s majority joint venture partner in GeoRXT, Georadar. The Company initially deferred 30% (ION’s ownership percentage in GeoRXT) of its profit on this sale and is being recognized over the period that GeoRXT depreciates the equipment.

On July 1, 2013, the Company agreed to loan up to $10 million to INOVA Geophysical through a promissory note due on September 30, 2013, and accruing interest at an annual rate equal to the London Interbank Offered Rate plus 650 basis points. Also on July 1, 2013, the Company advanced $5 million to INOVA Geophysical under this promissory note. On July 22, 2013, the Company advanced the remaining $5 million to INOVA Geophysical. This loan is to support short-term working capital needs from time-to-time.

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Other Income (Expense) Other Income (Expense)

6 Months Ended

Jun. 30, 2013

Other Income and Expenses [Abstract]

Other Income (Expense)

Other Income (Expense)

A summary of other income (expense) is as follows (in thousands):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Accrual for loss contingency related to legal proceedings (Note 8)	$	(110,000	)	$	—	$	(110,000	)	$	—
Gain on sale of investment	3,591			—		3,591			—
Other income (expense)	(709		)	895		318			209
Total other income (expense)	$	(107,118	)	$	895	$	(106,091	)	$	209

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Net Income per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Computation of basic and diluted net income per common share

The following table summarizes the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Net income (loss) applicable to common shares	$	(71,134	)	$	12,039	$	(69,597	)	$	20,276
Income impact of assumed Series D Preferred Stock conversion	—			338		—			676
Net income (loss) after assumed Series D Preferred Stock conversion	$	(71,134	)	$	12,377	$	(69,597	)	$	20,952
Weighted average number of common shares outstanding	156,910			155,631		156,689			155,587
Effect of dilutive stock awards	—			879		—			942
Effect of convertible preferred stock	—			6,065		—			6,065
Weighted average number of diluted common shares outstanding	156,910			162,575		156,689			162,594
Basic net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13
Diluted net income (loss) per share	$	(0.45	)	$	0.08	$	(0.44	)	$	0.13

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Summary of Segment Information

A summary of segment information is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net revenues:
Solutions:
New Venture	$	33,249	$	21,544	$	81,685	$	50,538
Data Library	21,521		22,235		30,969		32,503
Total multi-client revenues	54,770		43,779		112,654		83,041
Data Processing	33,849		28,190		65,135		55,055
Total	$	88,619	$	71,969	$	177,789	$	138,096
Systems:
Towed Streamer	$	12,570	$	13,727	$	26,119	$	29,531
Ocean Bottom	383		1,616		7,148		5,135
Other	10,895		7,476		22,428		24,859
Total	$	23,848	$	22,819	$	55,695	$	59,525
Software:
Software Systems	$	7,464	$	9,551	$	15,405	$	17,921
Services	984		875		1,763		1,382
Total	$	8,448	$	10,426	$	17,168	$	19,303
Total	$	120,915	$	105,214	$	250,652	$	216,924
Gross profit:
Solutions	$	21,890	$	28,904	$	42,087	$	47,889
Systems	8,802		9,234		17,182		25,046
Software	5,926		7,805		12,306		14,164
Total	$	36,618	$	45,943	$	71,575	$	87,099

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Gross margin:
Solutions	25		%	40		%	24		%	35		%
Systems	37		%	40		%	31		%	42		%
Software	70		%	75		%	72		%	73		%
Total	30		%	44		%	29		%	40		%
Income from operations:
Solutions	$	11,021		$	17,434		$	18,378		$	27,040
Systems	1,504			995			2,438			9,735
Software	4,955			6,879			10,116			12,361
Corporate and other	(10,710		)	(12,336		)	(22,239		)	(24,521		)
Income from operations	6,770			12,972			8,693			24,615
Interest expense, net	(2,756		)	(1,364		)	(3,822		)	(2,882		)
Equity in earnings (losses) of investments	(6,338		)	3,777			(5,222		)	6,245
Other income (expense), net	(107,118		)	895			(106,091		)	209
Income (loss) before income taxes	$	(109,442	)	$	16,280		$	(106,442	)	$	28,187

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	ION GEOPHYSICAL CORP
Entity Central Index Key	0000866609
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		157,053,797

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Equity Method Investments (Tables)

6 Months Ended

Jun. 30, 2013

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Change in Equity Method Investments

The following table reflects the change in the Company’s equity method investments and note receivable from equity method investees during the six months ended June 30, 2013 (in thousands):

	INOVA Geophysical			GeoRXT			Total
Investment at December 31, 2012	$	73,925		$	—		$	73,925
Investment in equity	—			1,500			1,500
Note receivable	—			8,000			8,000
Equity in losses of investments	(2,876		)	(2,346		)	(5,222		)
Equity interest in investees' other comprehensive income (loss)	(549		)	—			(549		)
Investments at June 30, 2013	$	70,500		$	7,154		$	77,654

Equity Method Investments Summarized Financial Information

The following table reflects the summarized financial information for INOVA Geophysical for the three months ended March 31, 2013 and 2012 and the six-month periods from October 1 to March 31 of 2013 and 2012 (in thousands):

	Three months ended March 31,					Six-Month Period from October 1 through March 31
	2013			2012		2013			2012
Net revenues	$	22,095		$	56,779	$	81,706		$	115,777
Gross profit	$	1,808		$	19,502	$	14,135		$	33,466
Income (loss) from operations	$	(8,511	)	$	8,910	$	(8,761	)	$	15,419
Net income (loss)	$	(9,772	)	$	8,654	$	(6,030	)	$	14,371

The following table reflects the summarized financial information for GeoRXT for the three months ended June 30, 2013 and the period from March 1 to June 30, 2013 (in thousands):

	Three Months Ended June 30, 2013			Period from March 1 to June 30, 2013
Net revenues	$	13,698		$	19,668
Gross profit	$	(195	)	$	122
Loss from operations	$	(5,107	)	$	(6,876	)
Net loss	$	(5,151	)	$	(7,045	)