Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (126,324)	$ (8,655)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	154,203	169,363
Impairment expense	89,479	0
Bad debt expense	1,484	960
Accretion of asset retirement obligations	447	454
Loss from equity method investments	221	348
Amortization of deferred financing costs and premium	1,682	2,044
Deferred income tax benefit	(30,066)	(10,402)
Capitalized interest	0	(469)
(Gain) loss on disposal of assets, net	3,760	(1,445)
Share-based compensation	9,277	11,666
Excess tax expense from share-based compensation	1,240	1,846
Changes in working capital:
Accounts receivable	51,585	20,225
Other current assets	(3,410)	8,592
Accounts payable, accrued interest and accrued expenses	(12,050)	(61,924)
Share-based compensation liability awards	(578)	1,262
Other assets and liabilities	(14,866)	23,153
Net cash provided by operating activities	126,084	157,018
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(108,120)	(111,021)
Proceeds from sale of fixed assets	12,288	7,530
Proceeds from notes receivable	3,990	0
Acquisition of the 50% noncontrolling interest in Geostream	0	(14,600)
Net cash used in investing activities	(91,842)	(118,091)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt	(3,573)	0
Repayments of capital lease obligations	0	(392)
Proceeds from borrowings on revolving credit facility	220,000	195,000
Repayments on revolving credit facility	(225,000)	(210,000)
Payment of deferred financing costs	0	(69)
Repurchases of common stock	(2,239)	(3,169)
Excess tax expense from share-based compensation	(1,240)	(1,846)
Net cash used in financing activities	(12,052)	(20,476)
Effect of changes in exchange rates on cash	6,896	212
Net increase in cash and cash equivalents	29,086	18,663
Cash and cash equivalents, beginning of period	28,306	45,949
Cash and cash equivalents, end of period	$ 57,392	$ 64,612