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Intangible Assets, Goodwill and Other Assets (Schedule of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
CO2 volumetric production payments, net of amortization $ 890   $ 2,175
Deferred marine charges, net 28,175   30,246
Contract Liabilities 72,241 $ 59,204 0
Other deferred costs and deposits 20,401   24,207
Other assets, net of amortization $ 121,707 $ 115,832 $ 56,628