Schedule I - Condensed Financial Information of Registrant - Statement of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 14, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		$ 64,191	$ 76,181	$ 30,799
INVESTING ACTIVITIES:
Net cash used in investing activities		(109,829)	(19,046)	(104,147)
FINANCING ACTIVITIES:
Payment of accrued dividends of cumulative redeemable preferred shares	$ (14,500)	0	(14,492)	0
Recapitalization transaction		79,658	0	0
Net cash provided by (used in) financing activities		119,704	(55,815)	69,662
CASH AND CASH EQUIVALENTS, BEGINNING OF THE PERIOD		33,512	35,460
CASH AND CASH EQUIVALENTS, END OF THE PERIOD		117,229	33,512	35,460
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Non-cash PIK Dividends		7,922	43,676	36,045
Settlement of accrued dividends of cumulative redeemable preferred shares		(114,381)	0	0
Non-cash transfer of treasury shares		(80)	0	0
Par value of vested restricted share awards		17	0	0
Par value of ordinary shares issued in exchange for warrants		747	0	0
Non-cash dividend to warrant holders		879	0	0
Parent Company
OPERATING ACTIVITIES:
Net cash provided by (used in) operating activities		66,631	4,562	(13)
INVESTING ACTIVITIES:
Investment in subsidiaries		(78,709)	0	0
Net cash used in investing activities		(78,709)	0	0
FINANCING ACTIVITIES:
Repayment of intercompany loans		(49,447)	(4,000)	0
Payment of accrued dividends of cumulative redeemable preferred shares		0	(553)	0
Recapitalization transaction		79,658	0	0
Net cash provided by (used in) financing activities		30,211	(4,553)	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		18,133	9	(13)
CASH AND CASH EQUIVALENTS, BEGINNING OF THE PERIOD		10	1	14
CASH AND CASH EQUIVALENTS, END OF THE PERIOD		18,143	10	1
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Issuance of intercompany loans		0	49,447	0
Redemption of cumulative redeemable preferred shares and payment of accrued dividends		0	(49,447)	0
Settlement of intercompany loan receivables		0	3,000	0
Settlement of intercompany loan payables		0	(3,641)	0
Accretion of issuance costs and discount on cumulative redeemable preferred shares		0	0	3,612
Non-cash PIK Dividends		7,922	43,676	36,045
Purchase of cumulative redeemable preferred shares		(239,492)	0	0
Settlement of accrued dividends of cumulative redeemable preferred shares		(114,381)	0	0
Non-cash transfer of treasury shares		(80)	0	0
Par value of vested restricted share awards		17	0	0
Par value of ordinary shares issued in exchange for warrants		747	0	0
Non-cash dividend to warrant holders		$ 879	$ 0	$ 0