Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 19,137	$ 48,265	$ 3,656
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, accretion, and amortization of intangible assets	165,084	179,937	179,110
Amortization of deferred financing costs and note discount	12,161	13,447	14,887
Share-based compensation expense	22,264	20,962	15,660
Deferred income tax expense (benefit)	11,768	6,741	(1,738)
Loss on disposal and impairment of assets	4,144	11,653	17,873
Other reserves and non-cash items	(11,635)	(16,959)	153
Redemption cost for early extinguishment of debt	3,018	0	6,408
Changes in assets and liabilities:
Decrease (increase) in accounts and notes receivable, net	3,952	(20,818)	28,015
Decrease (increase) in prepaid expenses, deferred costs, and other current assets	28,763	(2,288)	14,339
Decrease (increase) in inventory, net	2,073	(3,865)	(1,737)
Decrease in other assets	10,996	7,971	7,357
(Decrease) increase in accounts payable	(8,028)	8,233	(2,619)
Increase (decrease) in restricted cash liabilities	49,534	(70,482)	109,093
(Decrease) increase in accrued liabilities	(21,220)	35,266	(44,416)
Decrease in other liabilities	(9,662)	(13,404)	(11,839)
Net cash provided by operating activities	282,349	204,659	334,202
Cash flows from investing activities:
Additions to property and equipment	(91,142)	(124,906)	(107,205)
Acquisitions, net of cash acquired	0	(9,100)	(1,150)
Net cash used in investing activities	(91,142)	(134,006)	(108,355)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facility	747,003	656,326	882,763
Repayments of borrowings under revolving credit facility	(907,140)	(752,039)	(745,148)
Proceeds from issuance of term loan facility	500,000	0	0
Repayments of term loan facility	(2,500)	0	0
Repayments of convertible notes	(286,741)	0	0
Redemption of long-term notes	0	0	(250,000)
Debt issuance, modification, and redemption costs	(20,805)	(1,085)	(8,430)
Tax payments related to share-based compensation	(6,897)	(4,050)	(5,591)
Proceeds from exercises of stock options	293	3	14
Repurchase of common shares	(16,873)	(50,252)	0
Payment of contingent consideration	(5,180)	0	0
Net cash provided by (used in) financing activities	1,160	(151,097)	(126,392)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	1,759	2,503	(3,862)
Net increase (decrease) in cash, cash equivalents, and restricted cash	194,126	(77,941)	95,593
Cash, cash equivalents, and restricted cash as of beginning of period	117,469	195,410	99,817
Cash, cash equivalents, and restricted cash as of end of period	311,595	117,469	195,410
Supplemental disclosure of cash flow information:
Cash paid for interest	38,627	26,540	41,115
Cash (refunded) paid for income taxes, net	$ (7,058)
Cash (refunded) paid for income taxes, net		$ 7,699	$ 851