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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligations, Noncurrent [Abstract]    
Carrying Amount at Beginning of Period $ 1,110,710 $ 954,377
Liabilities Incurred 57,477 98,874
Liabilities Settled (1) [1] (54,027) (58,673)
Accretion 47,083 43,462
Revisions 53,888 72,425
Foreign Currency Translations 1,407 245
Carrying Amount at End of Period 1,216,538 1,110,710
Current Portion 49,548 37,127
Noncurrent Portion $ 1,166,990 $ 1,073,583
[1] Includes settlements related to asset sales.