Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 3,302	$ (69,431)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization (other than multi-client library)	7,476	15,766
Amortization of multi-client library	36,748	18,858
Stock-based compensation expense related to stock options, nonvested stock and employee stock purchases	3,727	3,343
Amortization of debt discount		8,656
Write-off of unamortized debt issuance costs		10,121
Fair value adjustment of warrant		(12,788)
Loss on disposition of land division		38,115
Equity in losses of INOVA Geophysical	5,033	179
Deferred income taxes	(8,192)	8,250
Change in operating assets and liabilities:
Accounts receivable	11,422	31,088
Unbilled receivables	25,284	(8,183)
Inventories	(22,051)	1,153
Accounts payable, accrued expenses and accrued royalties	(15,847)	(23,568)
Deferred revenue	16,630	1,768
Other assets and liabilities	(2,720)	(3,755)
Net cash provided by operating activities	60,812	19,572
Cash flows from investing activities:
Purchase of property, plant and equipment	(7,240)	(2,056)
Investment in multi-client data library	(46,102)	(21,226)
Purchase of short-term investments	(80,000)
Proceeds from sale of short-term investments	41,000
Investment in a convertible note	(6,500)
Proceeds from disposition of land division, net of fees paid		99,790
Advances to INOVA Geophysical		(6,500)
Other investing activities	50	(1,272)
Net cash provided by (used in) investing activities	(98,792)	68,736
Cash flows from financing activities:
Borrowings under revolving line of credit		85,000
Repayments under revolving line of credit		(174,429)
Net proceeds from the issuance of debt		105,695
Net proceeds from the issuance of stock		38,039
Payments on notes payable and long-term debt	(3,388)	(142,047)
Payment of preferred dividends	(676)	(1,260)
Contribution from noncontrolling interest	307
Proceeds from exercise of stock options	12,931
Other financing activities	(40)	(78)
Net cash provided by (used in) financing activities	9,134	(89,080)
Effect of change in foreign currency exchange rates on cash and cash equivalents	380	843
Net increase (decrease) in cash and cash equivalents	(28,466)	71
Cash and cash equivalents at beginning of period	84,419	16,217
Cash and cash equivalents at end of period	55,953	16,288
Non-cash items from investing and financing activities:
Transfer of inventory to rental equipment	2,978
Reduction in multi-client data library related to finalization of accrued liabilities	1,888
Expiration of BGP Warrant		32,001
Conversion of BGP Domestic Convertible Note to equity		28,571
Investment in INOVA Geophysical		119,000
Exchange of RXT receivables into shares		$ 9,516