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Borrowings (Scheduled Principal Repayments on Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
2016 $ 207,813  
2017 173,327  
2018 480,092  
2019 546,518  
2020 380,817  
Thereafter 1,639,001  
Total outstanding debt 3,427,568 $ 3,512,700
Amortization Other [Member]    
Debt Instrument [Line Items]    
2016 18,989  
2017 17,157  
2018 14,663  
2019 7,044  
2020 3,361  
Thereafter (1,004)  
Total outstanding debt 60,210  
Maturities    
Debt Instrument [Line Items]    
2016 188,824  
2017 156,170  
2018 465,429  
2019 539,474  
2020 377,456  
Thereafter 1,640,005  
Total outstanding debt $ 3,367,358