Pension Plans - Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	$ 4,308	$ 4,616	$ 4,802
Service cost	0	0	0
Interest cost	4	4	5
Benefits paid	(276)	(517)	(411)
Actuarial (gain)/loss	0	95	32
Curtailment/Settlement	0	0	0
Transfer from DBCPP to RAP	0	0	0
Currency translation adjustment	54	110	188
Projected benefit obligation, end of period	4,090	4,308	4,616
Change in plan assets:
Plan assets at fair value, beginning of period	0	0	0
Employer contributions	0
Benefits paid	0
Transfer to DCP	0
Currency translation adjustment	0
Plan assets at fair value, end of period	0	0	0
Amounts recognized in consolidated balance sheets:
Accrued and other current liabilities	585	257	488
Other noncurrent liabilities	3,505	4,051	4,128
Amount recognized in accumulated other comprehensive loss:
Defined benefit pension plans adjustment	378	373	271
Accumulated benefit obligation, end of period	$ 4,090	$ 4,308	$ 4,616