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Unevaluated Property (Summary of Unevaluated Properties Excluded from Amortization) (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of unevaluated properties excluded from oil and natural gas properties being amortized        
Property acquisition costs $ 0 $ 0 $ 8,527 $ 572,930
Exploration and development 3,522 1,862 3,175 108,268
Capitalized interest 31,489 27,013 23,134 92,990
Total 35,011 28,875 $ 34,836 $ 774,188
Property acquisition costs 581,457      
Exploration and development 116,827      
Capitalized interest 174,626      
Total $ 872,910 $ 996,700