Commitments and Contingencies - Available Lines of Credit, Outstanding Standby Letter of Credits, and Bonds (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Oct. 18, 2019
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit			$ 500,000,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit	$ 500,000,000	$ 500,000,000
Standby LOCs issued and outstanding	(64,374,000)	(64,948,000)
Line of credit facility, remaining borrowing capacity	235,626,000	235,052,000
Unsecured Multicurrency Revolving Lines of Credit [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit	94,845,000	99,201,000
Standby LOCs issued and outstanding	(19,957,000)	(24,966,000)
Short-term borrowings	0	0
Line of credit facility, remaining borrowing capacity	74,888,000	74,235,000
Surety Bond [Member]
Line of Credit Facility [Line Items]
Unsecured surety bonds in force	281,270,000	162,912,000
Line of Credit
Line of Credit Facility [Line Items]
Long-term borrowings	0	0
Line of credit facility, remaining borrowing capacity	$ 435,626,000	$ 435,052,000