Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (173,222)	$ (80,919)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	110,999	121,160
Accretion on asset retirement obligation	72	66
Change in allowance for doubtful accounts	(641)	(582)
Amortization of deferred financing costs	4,486	1,525
Amortization of premium on notes	(138)	(126)
Non-cash compensation	5,117	7,239
(Gain) loss on disposal of assets	261	(9)
Deferred income taxes	(4,404)	(45,037)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	24,010	121,348
Inventories	4,440	3,949
Income tax receivable	552	954
Prepaid expenses and other current assets	294	(978)
Other assets	(85)	160
Accounts payable	(21,488)	(23,474)
Other liabilities	(8,338)	(956)
Accrued expenses	16,077	(16,204)
Net cash (used in) provided by operating activities	(42,008)	88,116
Cash flows from investing activities:
Purchase of property and equipment	(11,561)	(34,823)
Proceeds from sale of assets	1,451	6,411
Net cash used in investing activities	(10,110)	(28,412)
Cash flows from financing activities:
Payments of debt	(25,422)	(43,111)
Proceeds from debt	165,000	0
Change in restricted cash	(30,196)	0
Purchase of treasury stock	(640)	(4,562)
Tax withholding from exercise of stock options	0	(3)
Exercise of employee stock options	0	727
Deferred loan costs and other financing activities	(17,256)	(848)
Net cash provided by (used in) financing activities	91,486	(47,797)
Net increase in cash and equivalents	39,368	11,907
Cash and cash equivalents - beginning of period	46,732	79,915
Cash and cash equivalents - end of period	$ 86,100	$ 91,822