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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Asset Retirement Obligations, Noncurrent [Abstract]    
Carrying Amount at Beginning of Period $ 752,718 $ 761,898
Liabilities Incurred 63,844 123,849
Liabilities Settled [1] (17,415) (247,422)
Accretion 31,956 41,489
Revisions (13,356) 82,885
Foreign Currency Translations (6,193) (9,981)
Carrying Amount at End of Period 811,554 752,718
Current Portion 7,651 11,814
Noncurrent Portion $ 803,903 $ 740,904
[1] Includes capitalized exploratory well costs charged to either dry hole costs or impairments.