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Financial Commitments (Principal Payments of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial Commitments [Abstract]    
2017 $ 85,890  
2018 478,583  
2019 12,294  
2020 5,378  
2021 218,923  
Thereafter 14,523  
Subtotal 815,591  
Less: Unamortized Discount and Issuance Cost (56,072) $ (6,697)
Total debt $ 759,519 $ 817,684