Comprehensive (Loss) Income - Schedule of Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Net (loss) income	$ (5,988)	$ (3,803)	$ (13,527)	$ (9,984)	$ (6,734)	$ 32,627	$ (23,318)	$ 15,909
Other comprehensive income (loss):
Adjustment to pension liability	732			689			2,197	2,068
Tax expense	(183)			(172)			(549)	(516)
Adjustment to pension liability, net of tax	549			517			1,648	1,552
Foreign currency translation adjustment, net of tax	(660)			(248)			(311)	(1,207)
Adoption of ASU 2018-2	0			0			(11,355)	0
Total other comprehensive (loss) income, net of tax	(111)	$ 926	$ 522	269	$ (288)	$ 364	(10,018)	345
Total comprehensive (loss) income	$ (6,099)			$ (9,715)			$ (33,336)	$ 16,254