Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (97,921)	$ (76,413)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	94,150	80,846
Accretion on asset retirement obligation	115	119
Change in allowance for doubtful accounts	278	1,907
Amortization of deferred financing costs	586	14
Amortization of debt discounts	3,708	5,649
Non-cash compensation	21,995	16,615
(Gain) loss on disposal of assets	3,891	(664)
Deferred income taxes	(78)	389
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(7,977)	(61,463)
Inventories	313	437
Income tax receivable	291	(1,740)
Prepaid expenses and other current assets	7,010	(9,446)
Other assets	(49)	(1,083)
Accounts payable	5,736	32,865
Other liabilities	8,629	3,046
Accrued expenses	15,705	10,747
Net cash provided by operating activities	56,382	1,825
Cash flows from investing activities:
Purchase of property and equipment	(48,588)	(48,295)
Proceeds from sale of assets	1,942	7,834
Net cash used in investing activities	(46,646)	(40,461)
Cash flows from financing activities:
Payments of debt	(50,313)	(33,649)
Proceeds from debt	32,500	64,000
Shares added to treasury stock as a result of net share settlements due to vesting of restricted stock	(1,717)	(38)
Deferred loan costs and other financing activities	(585)	(2,133)
Net cash provided by (used in) financing activities	(20,115)	28,180
Net decrease in cash, cash equivalents and restricted cash	(10,379)	(10,456)
Cash, cash equivalents and restricted cash - end of period	75,844	90,848
Cash, cash equivalents and restricted cash - beginning of period	86,223	101,304
Noncash investing and financing activity:
Capital leases and notes issued for equipment	16,565	61,040
Change in accrued property and equipment	$ 3,675	$ 8,726