Schedule I - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative									$ 63,038	$ 44,015	$ 46,108
Total operating expenses									260,009	197,453	183,870
Income (loss) from operations	$ 1,918	$ 10,110	$ 11,024	$ 2,238	$ 861	$ 9,136	$ 2,322	$ 2,183	25,290	14,502	(17,064)
Interest expense									37,607	55,511	59,963
Interest income									(207)	(108)	(57)
Income Tax Expense (Benefit)									8,377	1,889	3,000
Net loss	$ (10,345)	$ 4,347	$ (5,310)	$ (9,538)	$ (8,520)	$ (4,090)	$ (20,110)	$ (12,386)	(20,846)	(45,106)	(81,374)
Foreign currency translation adjustment									29	743	(2,735)
Total comprehensive loss									(20,817)	(44,363)	(84,109)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative									30	286	231
Total operating expenses									30	286	231
Income (loss) from operations									(30)	(286)	(231)
Equity in net loss of subsidiaries									16,396	28,302	62,450
Interest expense									1,383	16,518	15,165
Interest income									3,037	0	0
Loss before income taxes									(20,846)	(45,106)	(77,846)
Income Tax Expense (Benefit)									0	0	(3,528)
Net loss									(20,846)	(45,106)	(81,374)
Foreign currency translation adjustment									29	743	(2,735)
Total comprehensive loss									$ (20,817)	$ (44,363)	$ (84,109)