Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 157,779	$ 148,056
Accounts receivable, net	85,800	149,448
Unbilled receivables	63,769	49,468
Inventories	55,322	57,173
Prepaid expenses and other current assets	34,526	24,772
Total current assets	397,196	428,917
Deferred income tax asset	14,339	14,650
Property, plant, equipment and seismic rental equipment, net	59,623	46,684
Multi-client data library, net	246,054	238,784
Equity method investments	44,995	53,865
Goodwill	51,626	55,876
Intangible assets, net	9,932	11,247
Other assets	15,604	14,648
Total assets	839,369	864,671
Current liabilities:
Current maturities of long-term debt	10,664	5,906
Accounts payable	36,181	22,654
Accrued expenses	81,460	84,358
Accrued multi-client data library royalties	23,981	46,460
Deferred revenue	15,766	20,682
Total current liabilities	168,052	180,060
Long-term debt, net of current maturities	179,992	214,246
Other long-term liabilities	143,082	210,602
Total liabilities	491,126	604,908
Redeemable noncontrolling interest	6,846	1,878
Equity:
Common stock, $0.01 par value; authorized 200,000,000 shares; outstanding 164,086,011 and 163,737,757 shares at June 30, 2014 and December 31, 2013, respectively, net of treasury stock	1,641	1,637
Additional paid-in capital	884,796	879,969
Accumulated deficit	(528,990)	(606,157)
Accumulated other comprehensive loss	(9,854)	(11,138)
Treasury stock, at cost, 849,539 shares at both June 30, 2014 and December 31, 2013	(6,565)	(6,565)
Total stockholders' equity	341,028	257,746
Noncontrolling interests	369	139
Total equity	341,397	257,885
Total liabilities and equity	$ 839,369	$ 864,671