Employee Benefit Plans - Germany & UK (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension plans
Plan assets	$ 89,972	$ 87,215	$ 75,875
Weighted average expected long-term rate	2.73%
German Pension Plan | Unfunded Plan
Pension plans
Plan assets	$ 0
German Pension Plan | Unfunded Plan | Minimum
Pension plans
Qualifying period	10 years
U.K. Pension Plan
Pension plans
Historical performance period	10 years
Weighted average expected long-term rate	2.72%	3.47%
U.K. Pension Plan | Minimum
Pension plans
Minimum required years prior to retirement for eligibility	3 years
Historical performance period	15 years	10 years
U.K. Pension Plan | Maximum
Pension plans
Historical performance period	20 years	20 years
Asterion Pension Plan
Pension plans
Weighted average expected long-term rate	1.13%	0.79%
Asterion Pension Plan | Minimum
Pension plans
Minimum required years prior to retirement for eligibility	3 years
Norway Pension Plan
Pension plans
Weighted average expected long-term rate	3.10%	2.70%
Norway Pension Plan | Minimum
Pension plans
Minimum required years prior to retirement for eligibility	3 years