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Commitments and Contingencies Activity in Recorded Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance, beginning of year $ 60,246 $ 41,489    
Acquisitions 1,222 4,650    
Additions and changes in estimates 15,750 14,734    
Accretion of discount 2,531 2,035    
Liabilities settled (3,980) (3,289)    
Foreign currency translation adjustments and other 103 627    
Balance, end of year $ 60,246 $ 41,489 $ 75,872 $ 60,246
Less amounts reported in Accrued expenses     1,016 4,398
Amounts reported in Other noncurrent liabilities     $ 74,856 $ 55,848