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Long-term Debt (Maturities of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Future minimum repayments of long-term debt    
Within one year $ 105  
2 - 3 years 870,225  
4 - 5 years 2,225,248  
Over 5 years 1,475,761  
Long-term debt $ 4,571,339 $ 2,541,389