CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 36,760	$ 16,903
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	29,956	20,389
Stock-based compensation expense	6,959	13,324
Excess income tax benefit from stock-based compensation		(162)
Change in debt discount and deferred debt issuance costs	3,348	1,045
Deferred income taxes	(371)	(177)
Loss (gain) on sale of property and equipment	204	(313)
Other long-term liabilities	(3,811)	42
Other non-cash items	1,200	(3,259)
Changes in other components of working capital	(69,669)	(79,550)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	4,576	(31,758)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(8,681)	(29,544)
Proceeds from sale of property and equipment	1,092	1,122
Change in restricted cash	(3,599)	4,877
NET CASH USED IN INVESTING ACTIVITIES	(11,188)	(23,545)
Cash Flows from Financing Activities:
Proceeds from issuance of convertible notes	200,000
Proceeds from debt	711,092	473,490
Repayment of debt	(871,654)	(446,239)
Excess income tax benefit from stock-based compensation		162
Issuance of common stock and effect of cashless exercise		(776)
Debt issuance costs	(14,656)
NET CASH PROVIDED BY FINANCING ACTIVITIES	24,782	26,637
Net increase (decrease) in cash and cash equivalents	18,170	(28,666)
Cash and cash equivalents at beginning of year	75,452	135,583
Cash and cash equivalents at end of period	$ 93,622	$ 106,917