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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset Retirement Obligations, Noncurrent [Abstract]    
Carrying Amount at Beginning of Period $ 954,377 $ 946,848
Liabilities Incurred 98,874 79,057
Liabilities Settled (1) [1] (58,673) (70,829)
Accretion 43,462 36,622
Revisions 72,425 (38,932)
Foreign Currency Translations 245 1,611
Carrying Amount at End of Period 1,110,710 954,377
Current Portion 37,127 26,214
Noncurrent Portion $ 1,073,583 $ 928,163
[1]
Includes settlements related to asset sales.