Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,522)	$ 21,784	$ 17,905
Foreign currency translation adjustment	1,101	(159)	689
Loss on long-term intra-entity foreign currency transactions	(79)	(1,006)	0
Cash flow hedging activity	(1,713)	244	(749)
Reclassification of hedging activities into earnings	349	153	641
Pension plan adjustment	1,410	(1,920)	1,510
Reclassification of pension adjustments into earnings	254	650	306
Total other comprehensive income (loss), net of tax	1,322	(2,038)	2,397
Comprehensive income (loss)	$ (2,200)	$ 19,746	$ 20,302