Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (25,124)	$ (27,699)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	24,992	29,824
Provision for Doubtful Accounts	(363)	(55)
Gain on dispositions of property and equipment, net	(471)	(600)
Stock-based compensation expense	1,327	1,177
Amortization of debt issuance costs	465	424
Deferred income taxes	(169)	(2,201)
Change in other long-term assets	466	15
Change in other long-term liabilities	868	492
Changes in current assets and liabilities:
Receivables	(17,795)	13,189
Inventory	(1,911)	629
Prepaid expenses and other current assets	1,012	734
Accounts payable	778	(2,684)
Deferred revenues	(672)	1,656
Accrued expenses	(5,223)	(5,274)
Net cash provided by operating activities	(21,820)	9,627
Cash flows from investing activities:
Purchases of property and equipment	(24,683)	(5,532)
Proceeds from sale of property and equipment	7,148	477
Proceeds from insurance recoveries	3,119	0
Net cash used in investing activities	(14,416)	(5,055)
Cash flows from financing activities:
Debt repayments	(6,305)	0
Proceeds from issuance of debt	40,000	0
Debt issuance costs	0	(20)
Purchase of treasury stock	(363)	(43)
Net cash provided by (used in) financing activities	33,332	(63)
Net increase (decrease) in cash and cash equivalents	(2,904)	4,509
Beginning cash and cash equivalents	10,194	14,160
Ending cash and cash equivalents	7,290	18,669
Supplementary disclosure:
Interest paid	10,272	10,606
Income tax paid	261	279
Noncash investing and financing activity:
Change in capital expenditure accruals	$ 2,924	$ (39)