Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (116,250)	$ 99,896	$ (200,796)	$ 30,764
Adjustments to reconcile net (loss) income to net cash used in and provided by operating activities:
Depreciation and amortization	29,434	29,275	60,098	58,348
Stock-based compensation			10,300	7,444
Interest accretion on notes payable			605	664
Loss on debt extinguishment	5,087	6,231	6,106	6,231
Amortization of debt issuance costs			2,467	1,872
Other, including loss (gain) on disposal of assets			1,027	(151)
Gain on sale of investee				(724)
Decrease (increase) in accounts receivable			59,984	(63,700)
Increase in inventories, prepaid expenses and other current assets			(28,792)	(36,758)
Decrease in deposits and other assets			2,959	361
(Decrease) increase in ROU operating leases			(1,753)	2,003
Increase in accounts payable, deferred revenue, accrued liabilities and other long-term liabilities			40,564	121,411
Increase in operating lease liabilities			6,780	1,100
Increase (decrease) in accrued interest payable			8,699	(4,348)
Deferred income taxes			(78,951)	1,680
Net cash (used in) provided by operating activities			(110,703)	126,197
Cash flows from investing activities:
Additions to property and equipment			(75,623)	(96,762)
Property insurance recoveries			2,514	1,637
Proceeds from sale of assets				4
Net cash used in investing activities			(73,109)	(95,121)
Cash flows from financing activities:
Repayment of borrowings			(526,510)	(798,750)
Proceeds from borrowings			884,000	970,000
Payment of debt issuance costs			(21,462)	(8,927)
Payment of cash dividends			(21,418)	(138,259)
Proceeds from issuance of common stock			1,452	13,604
Stock repurchases			(6)	(4)
Reduction in finance lease liability			(184)
Purchase of redeemable noncontrolling interest			(4,976)	(217)
Net cash provided by financing activities			310,896	37,447
Effect of exchange rate on cash			(5,307)	667
Net increase in cash and cash equivalents			121,777	69,190
Cash and cash equivalents at beginning of period			174,179	44,608	$ 44,608
Cash and cash equivalents at end of period	$ 295,956	$ 113,798	295,956	113,798	$ 174,179
Supplemental cash flow information
Cash paid for interest			52,462	60,092
Cash paid for income taxes			$ 2,326	$ 17,407