CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 2,535	$ (35,830)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	38,602	32,669
Gain on extinguishment	0	(6,975)
Deferred income tax expense (benefit)	166	(18,644)
Amortization of deferred revenue rebate	1,385	1,385
Amortization of deferred debt issuance costs	3,322	1,806
Stock-based compensation	8,730	1,130
Loss on disposal of assets	28,971	12,859
Gain on interest rate swap	(226)	(54)
Changes in operating assets and liabilities:
Accounts receivable	(44,868)	3,255
Other current assets	3,271	(4)
Inventories	(4,435)	1,579
Prepaid expenses	(910)	2,845
Accounts payable	41,564	(2,294)
Accrued liabilities	589	620
Accrued interest	(23)	1
Net cash provided by (used in) operating activities	78,673	(5,652)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(193,820)	(18,631)
Proceeds from sale of assets	4,237	475
Net cash used in investing activities	(189,583)	(18,156)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings	27,112	0
Repayments of borrowings	(164,638)	(42,166)
Repayments of insurance financing	(2,900)	(2,833)
Debt extinguishment cost	0	(525)
Payment of debt issuance costs	(1,653)	(115)
Equity capitalization	0	40,425
Proceeds from IPO	185,500	0
Payment of IPO costs	(15,099)	0
Net cash provided by (used in) financing activities	28,322	(5,214)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(82,588)	(29,022)
CASH AND CASH EQUIVALENTS - Beginning of period	133,596	34,310
CASH AND CASH EQUIVALENTS - End of period	$ 51,008	$ 5,288