Commitments and Contingencies Available Lines of Credit, Outstanding Standby Letter of Credits, and Bonds (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Oct. 18, 2019
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit			$ 500,000
Net available for additional standby LOCs under sub-facility	$ 235,681	$ 235,626
Credit Facility [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit	500,000	500,000
Letters of Credit Outstanding, Amount	(64,319)	(64,374)
Line of Credit Facility, Remaining Borrowing Capacity	235,700
Unsecured Multicurrency Revolving Lines of Credit [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving line of credit	93,127	94,845
Letters of Credit Outstanding, Amount	(15,647)	(19,957)
Short-term borrowings	0	0
Line of Credit Facility, Remaining Borrowing Capacity	77,480	74,888
Surety Bond [Member]
Line of Credit Facility [Line Items]
Unsecured surety bonds in force	281,931	281,270
Line of Credit
Line of Credit Facility [Line Items]
Long-term Line of Credit	0	0
Line of Credit Facility, Remaining Borrowing Capacity	$ 435,681	$ 435,626