Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES
Net loss	$ (50,690)	$ (68,207)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	65,481	77,329
Bad debt expense		2,842
Loss on prepayment of debt, amortization of deferred financing costs, and accretion of debt discount	2,816	4,726
Stock-based compensation	1,008	1,205
(Gain) loss on disposal, exchange and sale of assets	(418)	524
Change in fair value of derivative liabilities	(5,604)	(8,972)
Changes in operating assets and liabilities:
Restricted cash, net of investing portion	4,332	(1,523)
Accounts receivable	51,242	40,216
Prepaid expenses and other assets	1,239	(2,926)
Deferred costs	4,143	(545)
Accounts payable	(36,423)	2,112
Deferred revenue	(13,810)	11,333
Accrued liabilities and other liabilities	3,192	(13,445)
Net cash provided by operating activities	26,508	44,669
INVESTING ACTIVITIES
Investment in multi-client data library, net	(29,130)	(40,256)
Purchases and acquisition of property and equipment	(9,267)	(9,381)
Purchases of other assets	(409)	(1,519)
Proceeds from sale/disposal of assets	14,786	1,626
Change in restricted cash	(6,917)
Net cash used in investing activities	(30,937)	(49,530)
FINANCING ACTIVITIES
Proceeds from issuance of debt		58,312
Net change in short-term debt	(1,782)
Payments on capital lease obligations and vendor financing	(2,109)	(936)
Payments on debt		(33,000)
Payments of debt issuance costs	(321)	(587)
Net cash provided by (used in) financing activities	(4,212)	23,789
Net increase (decrease) in cash	(8,641)	18,928
Cash at the beginning of period	44,647	42,851
Cash at the end of period	36,006	61,779
Cash disclosures:
Interest paid	18,379	16,800
Income taxes paid	2,571	3,817
Non-cash disclosures:
Capitalized depreciation to multi-client data library	2,407	2,440
Purchases of property and equipment under capital lease obligations and vendor financings, net of down payments	$ 2,430	$ 3,835