Employee Benefit Plans - Employer Contributions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Non-qualified pension plans
Employee benefit plans
Expect to make contributions to our foreign pension plans.	$ 5,300,000
United States
Employee benefit plans
Employer contributions	0
Contributions (employer and employee)	5,500,000	$ 5,800,000
Foreign Plan
Employee benefit plans
Contributions (employer and employee)	900,000	$ 900,000
Expect to make contributions to our foreign pension plans.	$ 1,200,000