Summary of Significant Accounting Policies - The Balances in the Company's Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 154,638	$ 93,752	$ 93,033
Total other comprehensive income (loss)	1,931	(3,739)	19,633
Ending balance	166,682	154,638	93,752
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(16,251)	(12,750)	(32,342)
Other comprehensive income (loss) before reclassifications	1,649	(3,501)	2,391
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	17,201
Reclassification of stranded tax effects to retained earnings		0
Total other comprehensive income (loss)	1,649	(3,501)	19,592
Ending balance	(14,602)	(16,251)	(12,750)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,029)	(1,791)	(1,832)
Other comprehensive income (loss) before reclassifications	209	14	(31)
Amounts reclassified from accumulated other comprehensive income, net of tax	73	63	72
Reclassification of stranded tax effects to retained earnings		(315)
Total other comprehensive income (loss)	282	(238)	41
Ending balance	(1,747)	(2,029)	(1,791)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(18,280)	(14,541)	(34,174)
Other comprehensive income (loss) before reclassifications	1,858	(3,487)	2,360
Amounts reclassified from accumulated other comprehensive income, net of tax	73	63	17,273
Reclassification of stranded tax effects to retained earnings		(315)
Total other comprehensive income (loss)	1,931	(3,739)	19,633
Ending balance	$ (16,349)	$ (18,280)	$ (14,541)