Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (15,115)	$ (11,139)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	22,653	23,747
Allowance for doubtful accounts, net of recoveries	62	(52)
Gain on dispositions of property and equipment, net	(1,075)	(335)
Stock-based compensation expense	867	1,259
Phantom stock compensation expense	848	430
Amortization of debt issuance costs and discount	763	707
Impairment	1,046	0
Deferred income taxes	1,156	911
Change in other noncurrent assets	699	(463)
Change in other noncurrent liabilities	(20)	1,414
Changes in current assets and liabilities:
Receivables	(17,488)	(3,296)
Inventory	(1,293)	(2,042)
Prepaid expenses and other current assets	(178)	882
Accounts payable	2,339	51
Deferred revenues	(64)	(108)
Accrued expenses	(5,990)	(6,908)
Net cash provided by (used in) operating activities	(10,790)	5,058
Cash flows from investing activities:
Purchases of property and equipment	(16,844)	(11,657)
Proceeds from sale of property and equipment	1,043	1,283
Proceeds from insurance recoveries	0	523
Net cash used in investing activities	(15,801)	(9,851)
Cash flows from financing activities:
Debt issuance costs	0	(33)
Purchase of treasury stock	(120)	(96)
Net cash used in financing activities	(120)	(129)
Net decrease in cash, cash equivalents and restricted cash	(26,711)	(4,922)
Beginning cash, cash equivalents, and restricted cash	54,564	75,648
Ending cash, cash equivalents, and restricted cash	27,853	70,726
Supplementary disclosure:
Interest paid	13,887	13,515
Income tax paid	1,013	658
Change in capital expenditure accruals	$ 1,531	$ 2,931