Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income (loss)		$ 28,496	$ (12,721)	$ 49,090	$ (45,022)
Other comprehensive income (loss):
Foreign currency translation gain, net of tax		690	409	320	(304)
Comprehensive income (loss)		29,186	(12,312)	49,410	(45,326)
Net income (loss)		$ 28,496	$ (12,721)	$ 49,090	$ (45,022)
Predecessor [Member]
Net income (loss)	$ 298,582
Other comprehensive income (loss):
Foreign currency translation gain, net of tax
Comprehensive income (loss)	298,582
Net income (loss)	$ 298,582