CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 46,397	$ 36,760
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	28,987	28,185
Amortization of intangible assets	1,771	1,771
Share-based compensation expense	10,420	6,959
Change in debt discounts and deferred debt issuance costs	11,950	3,348
Deferred income taxes	(1)	(371)
(Gain) loss on sale of property and equipment	(349)	204
Other long-term liabilities	(2,801)	(3,811)
Other non-cash items	1,785	1,200
Changes in other components of working capital	(132,779)	(69,669)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(34,620)	4,576
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(8,183)	(8,681)
Proceeds from sale of property and equipment	1,336	1,092
Investments in securities restricted in use	(9,297)
Change in restricted cash	(1,547)	(3,599)
NET CASH USED IN INVESTING ACTIVITIES	(17,691)	(11,188)
Cash Flows from Financing Activities:
Proceeds from issuance of convertible notes		200,000
Proceeds from debt	1,276,457	711,092
Repayment of debt	(1,171,954)	(871,654)
Issuance of common stock and effect of cashless exercise	(10,809)
Distributions paid to noncontrolling interests	(2,500)
Contributions from noncontrolling interests	1,250
Debt issuance costs	(13,309)	(14,656)
NET CASH PROVIDED BY FINANCING ACTIVITIES	79,135	24,782
Net increase in cash and cash equivalents	26,824	18,170
Cash and cash equivalents at beginning of period	146,103	75,452
Cash and cash equivalents at end of period	$ 172,927	$ 93,622