Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 60,971	$ 42,402
Short-term investments	0	20,000
Accounts receivable, net	127,136	130,612
Unbilled receivables	89,784	25,628
Inventories	70,675	70,145
Prepaid expenses and other current assets	25,605	13,460
Total current assets	374,171	302,247
Deferred income tax asset	28,414	17,645
Property, plant, equipment and seismic rental equipment net	33,772	24,771
Multi-client data library, net	230,315	175,768
Investment in INOVA Geophysical	73,925	72,626
Goodwill	55,349	53,963
Intangible assets, net	14,841	17,716
Other assets	9,796	9,322
Total assets	820,583	674,058
Current liabilities:
Current maturities of long-term debt	3,496	5,770
Accounts payable	28,688	22,296
Accrued expenses	124,095	61,384
Accrued multi-client data library royalties	26,300	15,318
Deferred revenue	26,899	33,802
Total current liabilities	209,478	138,570
Long-term debt, net of current maturities	101,832	99,342
Other long-term liabilities	8,131	7,719
Total liabilities	319,441	245,631
Redeemable noncontrolling interest	2,123	2,615
Commitments and contingencies
Stockholders' equity:
Cumulative convertible preferred stock	27,000	27,000
Common stock,$0.01 par value; authorized 200,000,000 shares; outstanding 156,356,949 and 155,479,776 shares at December 31, 2012 and 2011, respectively, net of treasury stock	1,564	1,555
Additional paid-in capital	848,669	843,271
Accumulated deficit	(360,297)	(423,612)
Accumulated other comprehensive loss	(11,886)	(16,193)
Treasury stock, at cost, 849,539 shares at both December 31, 2012 and 2011	(6,565)	(6,565)
Total stockholders' equity	498,485	425,456
Noncontrolling interests	534	356
Total equity	499,019	425,812
Total liabilities and equity	$ 820,583	$ 674,058