CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income	$ 65,561	$ 36,580
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	47,295	30,959
Stock-based compensation expense	10,109	17,064
Excess income tax benefit from stock-based compensation	(10)	(186)
Change in debt discount and deferred debt issuance costs	7,124	1,569
Deferred income taxes	(8,636)	6,366
(Gain) loss on sale of property and equipment	300	(821)
Other long-term liabilities	(8,555)	(1,379)
Other non-cash items	(353)	(5,692)
Changes in other components of working capital	(18,669)	(63,786)
NET CASH PROVIDED BY OPERATING ACTIVITIES	94,166	20,674
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(10,273)	(33,365)
Proceeds from sale of property and equipment	1,139	2,220
Change in restricted cash	(2,872)	5,798
NET CASH USED IN INVESTING ACTIVITIES	(12,006)	(25,347)
Cash Flows from Financing Activities:
Proceeds from issuance of convertible notes	200,000
Proceeds from debt	1,003,092	672,719
Repayment of debt	(1,174,679)	(706,113)
Excess income tax benefit from stock-based compensation	10	186
Issuance of common stock and effect of cashless exercise	(423)	(808)
Debt issuance costs	(14,868)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	13,132	(34,016)
Net increase (decrease) in cash and cash equivalents	95,292	(38,689)
Cash and cash equivalents at beginning of year	75,452	135,583
Cash and cash equivalents at end of period	$ 170,744	$ 96,894