Condensed Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 43,290	$ 84,419
Short-term investments	28,000	0
Accounts receivable, net	87,923	77,576
Unbilled receivables	45,378	70,590
Inventories	94,240	66,882
Prepaid expenses and other current assets	13,021	13,165
Total current assets	311,852	312,632
Deferred income tax asset	13,180	8,998
Property, plant and equipment, net	22,478	20,145
Multi-client data library, net	146,781	112,620
Investment in INOVA Geophysical	86,894	95,173
Goodwill	51,576	51,333
Intangible assets, net	16,674	20,317
Other assets	10,754	3,224
Total assets	660,189	624,442
Current liabilities:
Current maturities of long-term debt	4,859	6,073
Accounts payable	29,848	30,940
Accrued expenses	56,382	59,835
Accrued multi-client data library royalties	15,523	18,667
Deferred revenue	36,917	17,851
Total current liabilities	143,529	133,366
Long-term debt, net of current maturities	98,921	102,587
Other long-term liabilities	7,429	8,042
Total liabilities	249,879	243,995
Equity:
Cumulative convertible preferred stock	27,000	27,000
Common stock, $0.01 par value; authorized 200,000,000 shares; outstanding 155,195,407 and 152,870,679 shares at September 30, 2011 and December 31, 2010, respectively, net of treasury stock	1,552	1,529
Additional paid-in capital	839,161	822,399
Accumulated deficit	(435,963)	(448,386)
Accumulated other comprehensive loss	(15,064)	(15,530)
Treasury stock, at cost, 849,539 shares both at September 30, 2011 and December 31, 2010	(6,565)	(6,565)
Total stockholders' equity	410,121	380,447
Noncontrolling interest	189	0
Total equity	410,310	380,447
Total liabilities and equity	$ 660,189	$ 624,442