Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (64,095)	$ (3,958)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	103,279	112,401
Goodwill and tradenames impairment	28,687	0
Bad debt expense	1,151	901
Accretion of asset retirement obligations	294	305
Loss from equity method investments	79	242
Amortization of deferred financing costs and premium	1,121	1,358
Deferred income tax benefit	(7,707)	(3,085)
Capitalized interest	0	(292)
Loss on disposal of assets, net	3,452	848
Share-based compensation	7,101	9,393
Excess tax expense from share-based compensation	1,221	1,501
Changes in working capital:
Accounts receivable	46,970	(30,449)
Other current assets	(2,419)	4,611
Accounts payable, accrued interest and accrued expenses	(13,781)	(40,457)
Share-based compensation liability awards	1,587	493
Other assets and liabilities	328	(7,131)
Net cash provided by operating activities	107,268	46,681
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(69,429)	(72,577)
Proceeds from sale of fixed assets	7,239	3,881
Proceeds from notes receivable	2,150	0
Acquisition of the 50% noncontrolling interest in Geostream	0	(14,600)
Net cash used in investing activities	(60,040)	(83,296)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of long-term debt	(3,573)	0
Repayments of capital lease obligations	0	(379)
Proceeds from borrowings on revolving credit facility	115,000	155,000
Repayments on revolving credit facility	(160,000)	(135,000)
Payment of deferred financing costs	0	(69)
Repurchases of common stock	(2,211)	(3,134)
Excess tax expense from share-based compensation	(1,221)	(1,501)
Net cash provided by (used in) financing activities	(52,005)	14,917
Effect of changes in exchange rates on cash	(81)	484
Net decrease in cash and cash equivalents	(4,858)	(21,214)
Cash and cash equivalents, beginning of period	28,306	45,949
Cash and cash equivalents, end of period	$ 23,448	$ 24,735