Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (78,604)	$ (22,556)	$ (30,461)	$ 42,988	$ (188,618)	$ 13,567
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	22,518		29,417		69,877	77,636
Amortization of debt discount and issuance costs					1,793	1,026
Share-based compensation					7,867	6,612
Loss on derivative financial instruments					9,737	199
Impairment loss	867		0		42,308	0
Deferred income taxes					(8,243)	(9,786)
Loss on sale of assets	0		0		1,729	0
Amortization of key money					(673)	(187)
Other					1,718	2,018
Changes in assets and liabilities:
Trade and other receivables, net					48,328	15,911
Accounts receivable from related parties					2,715	2,715
Inventories					1,870	320
Prepayments and other assets					1,508	(10,418)
Trade and other payables					(51,663)	(12,882)
Payables to related parties					1,663	3,548
Income tax payable					(866)	(1,578)
Other liabilities					(1,602)	4,349
Net cash (used in) provided by operating activities					(60,552)	93,050
INVESTING ACTIVITIES
Capital expenditures					(28,817)	(165,484)
Receipt of key money					8,500	2,500	$ 6,500
Purchase of intangibles					(466)	(2,485)
Proceeds from the sale of assets, net					58,507	104
Property damage insurance proceeds					0	2,009
Net cash provided by (used in) investing activities					37,724	(163,356)
FINANCING ACTIVITIES
Proceeds from debt issuances, net of discount					199,600	0
Issuance costs of debt					(8,677)	0
Proceeds from ordinary shares, net of issuance costs					19,558	0
Repayments of debt					(7,575)	(7,575)
Proceeds from borrowings on revolving credit facility					40,000	0
Repayments of borrowings on revolving credit facility					(15,333)	0
Repurchase of ordinary shares					(2,500)	(10,307)
Repurchase of ordinary shares for tax withholdings					(54)	0
Principal payments on financing lease obligations					(20)	0
Net cash provided by (used in) financing activities					224,999	(17,882)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS					202,171	(88,188)
CASH AND CASH EQUIVALENTS, BEGINNING OF THE PERIOD		20,931		116,353	20,931	116,353	116,353
CASH AND CASH EQUIVALENTS, END OF THE PERIOD	223,102		28,165		223,102	28,165	20,931
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents								$ 195,516	$ 20,931	$ 28,165
Restricted cash								27,586	0	0
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH	$ 223,102	$ 20,931	$ 28,165	$ 116,353	223,102	28,165	$ 116,353	$ 223,102	$ 20,931	$ 28,165
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest, net of interest capitalized					48,762	33,373
Cash paid for income taxes, net					2,146	6,527
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Capital expenditures incurred but not yet paid					3,109	9,046
Right-of-use assets obtained in exchange for new financing lease liabilities					2,333	0
Right-of-use assets obtained in exchange for new operating lease liabilities					0	1,393
Termination of right-of-use asset and operating lease liability					646	0
Intangible assets capitalized but not yet paid					225	459
Par value of vested restricted share awards					94	45
Interest capitalized but not yet paid					$ 0	$ 35