Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 129,847	$ 148,056
Accounts receivable, net	86,738	149,448
Unbilled receivables	57,477	49,468
Inventories	55,376	57,173
Prepaid expenses and other current assets	26,453	24,772
Total current assets	355,891	428,917
Deferred income tax asset	14,340	14,650
Property, plant, equipment and seismic rental equipment, net	60,365	46,684
Multi-client data library, net	243,917	238,784
Equity method investments	40,174	53,865
Goodwill	50,385	55,876
Intangible assets, net	9,191	11,247
Other assets	19,482	14,648
Total assets	793,745	864,671
Current liabilities:
Current maturities of long-term debt	5,901	5,906
Accounts payable	30,666	22,654
Accrued expenses	75,608	84,358
Accrued multi-client data library royalties	24,416	46,460
Deferred revenue	16,495	20,682
Total current liabilities	153,086	180,060
Long-term debt, net of current maturities	179,583	214,246
Other long-term liabilities	142,776	210,602
Total liabilities	475,445	604,908
Redeemable noncontrolling interest	2,086	1,878
Equity:
Common stock, $0.01 par value; authorized 200,000,000 shares; outstanding 164,203,639 and 163,737,757 shares at September 30, 2014 and December 31, 2013, respectively, net of treasury stock	1,642	1,637
Additional paid-in capital	886,170	879,969
Accumulated deficit	(553,531)	(606,157)
Accumulated other comprehensive loss	(11,720)	(11,138)
Treasury stock, at cost, 849,539 shares at both September 30, 2014 and December 31, 2013	(6,565)	(6,565)
Total stockholders' equity	315,996	257,746
Noncontrolling interests	218	139
Total equity	316,214	257,885
Total liabilities and equity	$ 793,745	$ 864,671