Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 34,785	$ 30,337
Other comprehensive income (loss)
Foreign currency translation adjustment	0	1,725
Deferred gain on available for sale securities, net of tax	0	834
Current period cash flow hedging activity, net of $941 tax expense in 2017	0	1,543
Reclassification of hedging activities into earnings, net of $1,255 tax expense in 2017	0	(2,369)
Current period pension and postretirement plan adjustment, net of $14 tax benefit in 2018 and net of $440 tax expense in 2017, respectively	(301)	749
Reclassification of pension and postretirement adjustments into earnings, net of $85 and $363 tax benefit in 2018 and 2017, respectively	489	582
Total other comprehensive income	188	3,064
Comprehensive income	$ 34,973	$ 33,401