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