Business Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Profit for reportable segments	$ 144	$ 9,001
Interest expense - net	(817)	(1,355)
Other income - net	135	150
Unallocated corporate expenses and other unallocated charges	(2,156)	(3,468)
(Loss) income before income taxes	$ (2,694)	$ 4,328