Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (35,036)	$ (55,516)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization (other than multi-client data library)	5,672	6,525
Amortization of multi-client data library	7,139	5,289
Stock-based compensation expense	743	1,480
Deferred income taxes	54	(12)
Change in operating assets and liabilities:
Accounts receivable	29,211	74,388
Unbilled receivables	2,212	(1,523)
Inventories	350	(468)
Accounts payable, accrued expenses and accrued royalties	(10,558)	(39,144)
Deferred revenue	(527)	3,137
Other assets and liabilities	3,219	(862)
Net cash provided by (used in) operating activities	2,479	(6,706)
Cash flows from investing activities:
Cash invested in multi-client data library	(6,327)	(9,088)
Purchase of property, plant, equipment and seismic rental assets	(266)	(11,994)
Other investing activities	0	257
Net cash used in investing activities	(6,593)	(20,825)
Cash flows from financing activities:
Repurchase of common stock	(964)	0
Payments on notes payable and long-term debt	(2,212)	(2,066)
Costs associated with issuance of debt	(1,315)	0
Other financing activities	13	31
Net cash used in financing activities	(4,478)	(2,035)
Effect of change in foreign currency exchange rates on cash and cash equivalents	329	396
Net decrease in cash and cash equivalents	(8,263)	(29,170)
Cash and cash equivalents at beginning of period	84,933	173,608
Cash and cash equivalents at end of period	$ 76,670	$ 144,438