Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net loss	$ (2,898)	$ (27,187)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	91,317	93,633
Allowance for doubtful accounts	396	408
Gain on dispositions of property and equipment	(1,731)	(1,721)
Stock-based compensation expense	3,827	3,064
Amortization of debt issuance costs, discount and premium	1,504	1,534
Loss on extinguishment of debt	22,482	0
Impairment charges	0	44,788
Deferred income taxes	(3,762)	(16,717)
Change in other long-term assets	4,448	(2,113)
Change in other long-term liabilities	(1,284)	(1,340)
Changes in current assets and liabilities:
Receivables	(23,463)	(22,179)
Inventory	(234)	(592)
Prepaid expenses and other current assets	(77)	4,147
Accounts payable	7,667	353
Deferred revenues	2,607	(1,513)
Accrued expenses	(5,312)	(3,888)
Net cash provided by operating activities	95,487	70,677
Cash flows from investing activities:
Purchases of property and equipment	(74,567)	(112,179)
Proceeds from sale of property and equipment	6,538	6,059
Net cash used in investing activities	(68,029)	(106,120)
Cash flows from financing activities:
Debt repayments	(330,013)	(10,862)
Proceeds from issuance of debt	320,000	40,000
Debt issuance costs	(6,187)	(13)
Tender premium costs	(15,381)	0
Proceeds from exercise of options	1,581	789
Purchase of treasury stock	(1,132)	(628)
Net cash provided by (used in) financing activities	(31,132)	29,286
Net decrease in cash and cash equivalents	(3,674)	(6,157)
Beginning cash and cash equivalents	27,385	23,733
Ending cash and cash equivalents	23,711	17,576
Supplementary disclosure:
Interest paid	25,250	23,180
Income tax paid	$ 2,131	$ 1,627