CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 71,697	$ 65,561
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	37,806	44,638
Amortization of intangible assets	2,657	2,657
Share-based compensation expense	16,057	10,109
Excess income tax benefit from share-based compensation		(10)
Change in debt discounts and deferred debt issuance costs	14,725	7,124
Deferred income taxes	642	(8,636)
(Gain) loss on sale of property and equipment	(376)	300
Other long-term liabilities	(2,876)	(8,555)
Other	4,785	(353)
Changes in other components of working capital	(143,213)	(18,669)
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,904	94,166
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(9,712)	(10,273)
Proceeds from sale of property and equipment	1,440	1,139
Investments in securities restricted in use	(48,657)
Change in restricted cash	33,080	(2,872)
NET CASH USED IN INVESTING ACTIVITIES	(23,849)	(12,006)
Cash Flows from Financing Activities:
Proceeds from issuance of convertible notes		200,000
Proceeds from debt	1,991,457	1,003,092
Repayment of debt	(1,866,072)	(1,174,679)
Excess income tax benefit from share-based compensation		10
Issuance of common stock and effect of cashless exercise	(11,147)	(423)
Distributions paid to noncontrolling interests	(2,500)
Contributions from noncontrolling interests	1,250
Debt issuance and extinguishment costs	(15,268)	(14,868)
NET CASH PROVIDED BY FINANCING ACTIVITIES	97,720	13,132
Net increase in cash and cash equivalents	75,775	95,292
Cash and cash equivalents at beginning of period	146,103	75,452
Cash and cash equivalents at end of period	$ 221,878	$ 170,744