Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (87,458)	$ (22,556)	$ 1,040	$ 42,988	$ (110,014)	$ 44,028
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	22,400		25,908		47,359	48,219
Amortization of debt discount and issuance costs					679	681
Share-based compensation					5,942	4,762
Loss on derivative financial instruments					11,423	1,122
Impairment loss	25,268		0		41,441	0
Deferred income taxes					(12,573)	(14,341)
Loss on sale of assets	1,729		0		1,729	0
Amortization of key money					(439)	(110)
Other					(154)	628
Changes in assets and liabilities:
Trade and other receivables, net					44,462	1,743
Accounts receivable from related parties					2,855	1,504
Inventories					950	(224)
Prepayments and other assets					470	(4,845)
Trade and other payables					(61,207)	(5,512)
Payables to related parties					1,640	4,379
Income tax payable					(1,439)	(984)
Other liabilities					(1,520)	5,026
Net cash (used in) provided by operating activities					(28,396)	86,076
INVESTING ACTIVITIES
Capital expenditures					(7,414)	(92,038)
Receipt of key money					8,500	2,500	$ 6,500
Purchase of intangibles					(349)	(1,424)
Proceeds from the sale of assets, net					58,125	6
Property damage insurance proceeds					0	2,009
Net cash provided by (used in) investing activities					58,862	(88,947)
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					(5,050)	(5,050)
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)	(3,922)
Repurchase of ordinary shares for tax withholdings					(54)	0
Net cash provided by (used in) financing activities					227,544	(8,972)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS					258,010	(11,843)
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	278,941		104,510		278,941	104,510	20,931
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents								$ 251,022	$ 20,931	$ 104,510
Restricted cash								27,919	0	0
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH	$ 278,941	$ 20,931	$ 104,510	$ 116,353	278,941	104,510	$ 116,353	$ 278,941	$ 20,931	$ 104,510
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest, net of interest capitalized					28,919	22,616
Cash paid for income taxes, net					2,040	4,990
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Capital expenditures incurred but not yet paid					1,590	5,813
Intangible assets capitalized but not yet paid					208	474
Interest capitalized but not yet paid					0	95
Right-of-use assets obtained in exchange for new operating lease liabilities					0	1,393
Par value of vested restricted share awards					$ 93	$ 44