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, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 189,100	$ 166,682	$ 154,638
Total other comprehensive income (loss)	372	576	1,931
Ending balance	209,325	189,100	166,682
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(13,974)	(14,602)	(16,251)
Other comprehensive income (loss) before reclassifications	39	628	1,649
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Total other comprehensive income (loss)	39	628	1,649
Ending balance	(13,935)	(13,974)	(14,602)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,799)	(1,747)	(2,029)
Other comprehensive income (loss) before reclassifications	269	(113)	209
Amounts reclassified from accumulated other comprehensive income, net of tax	64	61	73
Total other comprehensive income (loss)	333	(52)	282
Ending balance	(1,466)	(1,799)	(1,747)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(15,773)	(16,349)	(18,280)
Other comprehensive income (loss) before reclassifications	308	515	1,858
Amounts reclassified from accumulated other comprehensive income, net of tax	64	61	73
Total other comprehensive income (loss)	372	576	1,931
Ending balance	$ (15,401)	$ (15,773)	$ (16,349)