Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (92,310)	$ (106,840)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	87,409	115,528
Allowance for doubtful accounts, net of recoveries	(302)	(358)
Write-off of obsolete inventory	21	0
Loss (gain) on dispositions of property and equipment, net	(420)	(2,639)
Stock-based compensation expense	2,998	2,275
Amortization of debt issuance costs	1,311	1,247
Loss on extinguishment of debt	299	490
Impairment charges	4,262	79,648
Deferred income taxes	(6,372)	(15,048)
Change in other long-term assets	426	438
Change in other long-term liabilities	(833)	(509)
Changes in current assets and liabilities:
Receivables	20,910	113,686
Inventory	855	1,533
Prepaid expenses and other current assets	2,726	3,233
Accounts payable	(2,425)	(29,547)
Deferred revenues	(4,353)	11,457
Accrued expenses	(6,558)	(35,529)
Net cash provided by operating activities	7,644	139,065
Cash flows from investing activities:
Purchases of property and equipment	(25,584)	(130,390)
Proceeds from sale of property and equipment	2,743	37,803
Proceeds from insurance recoveries	0	227
Net cash used in investing activities	(22,841)	(92,360)
Cash flows from financing activities:
Debt repayments	(500)	(45,003)
Proceeds from issuance of debt	12,000	0
Debt issuance costs	(819)	(999)
Proceeds from exercise of options	183	781
Purchase of treasury stock	(124)	(729)
Net cash provided by (used in) financing activities	10,740	(45,950)
Net increase (decrease) in cash and cash equivalents	(4,457)	755
Beginning cash and cash equivalents	14,160	34,924
Ending cash and cash equivalents	9,703	35,679
Supplementary disclosure:
Interest paid	22,849	21,543
Income tax paid	653	2,659
Noncash investing and financing activity:
Change in capital expenditure accruals	$ (1,592)	$ 308