Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (58,385)	$ (19,900)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization (other than multi-client data library)	17,024	19,660
Amortization of multi-client data library	23,161	24,531
Stock-based compensation expense	2,512	4,174
Reduction of accrual for loss contingency related to legal proceedings	0	(101,978)
Loss on extinguishment of debt	2,182	0
Deferred income taxes	1,031	5,992
Change in operating assets and liabilities:
Accounts receivable	9,325	92,424
Unbilled receivables	(3,711)	(9,837)
Inventories	2,374	464
Accounts payable, accrued expenses and accrued royalties	3,381	(43,676)
Deferred revenue	(2,103)	(2,576)
Other assets and liabilities	6,441	(5,274)
Net cash provided by (used in) operating activities	3,232	(35,996)
Cash flows from investing activities:
Cash invested in multi-client data library	(11,601)	(28,152)
Purchase of property, plant, equipment and seismic rental assets	(567)	(17,601)
Other investing activities	0	1,262
Net cash used in investing activities	(12,168)	(44,491)
Cash flows from financing activities:
Borrowings under revolving line of credit	15,000	0
Repurchase of common stock	(964)	0
Payments on notes payable and long-term debt	(6,726)	(5,431)
Costs associated with issuance of debt	(6,638)	(146)
Payment to repurchase bonds	(15,000)	0
Other financing activities	13	94
Net cash used in financing activities	(14,315)	(5,483)
Effect of change in foreign currency exchange rates on cash and cash equivalents	854	601
Net decrease in cash and cash equivalents	(22,397)	(85,369)
Cash and cash equivalents at beginning of period	84,933	173,608
Cash and cash equivalents at end of period	$ 62,536	$ 88,239