Stockholders' Equity - Reclassifications From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	$ 0
Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		$ (214)
Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0
Prior service cost | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(50)
Actuarial loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0
Actuarial loss | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(164)
Defined Benefit Pension and Postretirement Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0
Tax effect	0
Total reclassifications for the period, net of tax	$ 0
Defined Benefit Pension and Postretirement Items | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		(214)
Tax effect		0
Total reclassifications for the period, net of tax		$ (214)