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Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]            
Balance, beginning of year $ 42,592 $ 49,569 $ 39,808      
Expenditures (3,290) (6,037) (6,885)      
Accretion of discount 925 1,030 1,283      
Additions and changes in estimates 3,815 1,129 17,039      
Foreign currency translation adjustments and other 1,729 (3,099) (1,676)      
Balance, end of year $ 42,592 $ 49,569 $ 39,808 $ 45,771 $ 42,592 $ 49,569
Less amounts recorded in Accrued expenses       9,473 9,534 9,193
Amounts reported in Other noncurrent liabilities       $ 36,298 $ 33,058 $ 40,376