Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ (27,699)	$ (12,019)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	29,824	41,782
Allowance for doubtful accounts, net of recoveries	(55)	319
Loss (gain) on dispositions of property and equipment	(600)	1,133
Stock-based compensation expense	1,177	405
Amortization of debt issuance costs, discount and premium	424	413
Impairment charges	0	5,990
Deferred income taxes	(2,201)	(5,403)
Change in other long-term assets	15	440
Change in other long-term liabilities	492	503
Changes in current assets and liabilities:
Receivables	13,189	40,274
Inventory	629	431
Prepaid expenses and other current assets	734	1,615
Accounts payable	(2,684)	(19,429)
Deferred revenues	1,656	30,605
Accrued expenses	(5,274)	(22,178)
Net cash provided by operating activities	9,627	64,881
Cash flows from investing activities:
Purchases of property and equipment	(5,532)	(45,675)
Proceeds from sale of property and equipment	477	6,276
Proceeds from insurance recoveries	0	37
Net cash used in investing activities	(5,055)	(39,362)
Cash flows from financing activities:
Debt repayments	0	(25,002)
Debt issuance costs	(20)	(5)
Proceeds from exercise of options	0	601
Purchase of treasury stock	(43)	(359)
Net cash used in financing activities	(63)	(24,765)
Net increase in cash and cash equivalents	4,509	754
Beginning cash and cash equivalents	14,160	34,924
Ending cash and cash equivalents	18,669	35,678
Supplementary disclosure:
Interest paid	10,606	10,347
Income tax paid	279	664
Noncash investing and financing activity:
Change in capital expenditure accruals	$ (39)	$ 3,141