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Borrowings (Scheduled Principal Repayments on Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2016 $ 303,635  
2017 486,954  
2018 725,920  
2019 795,224  
2020 339,941  
Thereafter 1,848,038  
Total outstanding debt 4,499,712 $ 3,427,600
Amortization Other [Member]    
Debt Instrument [Line Items]    
2016 26,110  
2017 21,525  
2018 6,778  
2019 2,768  
2020 (677)  
Thereafter (1,350)  
Total outstanding debt 55,154  
Maturities    
Debt Instrument [Line Items]    
2016 277,525  
2017 465,429  
2018 719,142  
2019 792,456  
2020 340,618  
Thereafter 1,849,388  
Total outstanding debt $ 4,444,558