Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Components of accumulated other comprehensive loss
Unrecognized pension and postretirement benefit (costs), net of tax	$ 34
Foreign currency translation losses, net of tax	(2,703)
Total accumulated other comprehensive loss, net of tax	$ (2,669)
Predecessor
Components of accumulated other comprehensive loss
Unrecognized pension and postretirement benefit (costs), net of tax		$ (9,797)
Foreign currency translation losses, net of tax		(16,142)
Total accumulated other comprehensive loss, net of tax		$ (25,939)