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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 04, 2016
Asset Retirement Obligations, Noncurrent [Abstract]      
Carrying Amount at Beginning of Period $ 912,926 $ 811,554  
Liabilities Incurred (1) [1] 54,764 212,739  
Liabilities Settled (2) [2] (61,871) (94,800)  
Accretion 34,708 32,306  
Revisions (9,818) (38,286)  
Foreign Currency Translations 16,139 (10,587)  
Carrying Amount at End of Period 946,848 912,926  
Current Portion 19,259 18,516  
Noncurrent Portion 927,589 $ 894,410  
Long-Term Debt Related to Yates Transaction $ 163,829   $ 164,000
[1] Includes $164 million in 2016 related to Yates transaction (see Note 17).
[2] Includes settlements related to asset sales.