Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss	$ (89,300)	$ (2,898)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	80,271	91,317
Allowance for doubtful accounts	713	396
Gain on dispositions of property and equipment	(3,244)	(1,731)
Stock-based compensation expense	1,240	3,827
Amortization of debt issuance costs, discount and premium	827	1,504
Loss on extinguishment of debt	0	22,482
Impairment charges	77,319	0
Deferred income taxes	(8,267)	(3,762)
Change in other long-term assets	1,018	4,448
Change in other long-term liabilities	(1,606)	(1,284)
Changes in current assets and liabilities:
Receivables	91,881	(23,463)
Inventory	1,001	(234)
Prepaid expenses and other current assets	1,384	(77)
Accounts payable	(26,220)	7,667
Deferred revenues	22,798	2,607
Accrued expenses	(28,044)	(5,312)
Net cash provided by operating activities	121,771	95,487
Cash flows from investing activities:
Purchases of property and equipment	(84,027)	(74,567)
Proceeds from sale of property and equipment	34,538	6,538
Proceeds from insurance recoveries	227	0
Net cash used in investing activities	(49,262)	(68,029)
Cash flows from financing activities:
Debt repayments	(45,002)	(330,013)
Proceeds from issuance of debt	0	320,000
Debt issuance costs	(5)	(6,187)
Tender premium costs	0	(15,381)
Proceeds from exercise of options	753	1,581
Purchase of treasury stock	(711)	(1,132)
Net cash used in financing activities	(44,965)	(31,132)
Net increase (decrease) in cash and cash equivalents	27,544	(3,674)
Beginning cash and cash equivalents	34,924	27,385
Ending cash and cash equivalents	62,468	23,711
Supplementary disclosure:
Interest paid	11,385	25,250
Income tax paid	2,331	2,131
Noncash investing and financing activity:
Change in capital expenditure accruals	$ 11,133	$ 3,346