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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 04, 2016
Asset Retirement Obligations, Noncurrent [Abstract]      
Carrying Amount at Beginning of Period $ 946,848 $ 912,926  
Liabilities Incurred 79,057 54,764  
Liabilities Settled (1) [1] (70,829) (61,871)  
Accretion 36,622 34,708  
Revisions (38,932) (9,818)  
Foreign Currency Translations 1,611 16,139  
Carrying Amount at End of Period 954,377 946,848  
Current Portion 26,214 19,259  
Noncurrent Portion $ 928,163 $ 927,589  
Long-Term Debt Related to Yates Transaction     $ 163,829
[1] Includes settlements related to asset sales.