Summary of Significant Accounting Policies - The Balances in the Company's Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 166,682	$ 154,638
Total other comprehensive income (loss)	(2,755)	777
Ending balance	176,223	158,426
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(14,602)
Other comprehensive income (loss) before reclassifications	(2,755)
Total other comprehensive income (loss)	(2,755)
Ending balance	(17,357)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,747)
Other comprehensive income (loss) before reclassifications	0
Total other comprehensive income (loss)	0
Ending balance	(1,747)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(16,349)	(18,280)
Other comprehensive income (loss) before reclassifications	(2,755)
Total other comprehensive income (loss)	(2,755)
Ending balance	$ (19,104)	$ (17,503)