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	(26,487)	9,041
Deferred revenue	(8,242)	(6,176)
Other assets and liabilities	4,026	(1,912)
Net cash provided by operating activities	28,281	85,730
Cash flows from investing activities:
Investment in multi-client data library	(33,503)	(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	(49,740)	(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