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Borrowings (Scheduled Principal Repayments on Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ (335,698)  
2020 (843,747)  
2021 (338,480)  
2022 (664,287)  
2023 (360,227)  
Thereafter (1,985,889)  
Total outstanding debt (4,530,000) $ (4,502,057)
Maturities    
Debt Instrument [Line Items]    
2019 (333,115)  
2020 (842,456)  
2021 (340,618)  
2022 (667,000)  
2023 (362,250)  
Thereafter (1,992,018)  
Total outstanding debt (4,537,457)  
Amortization Other [Member]    
Debt Instrument [Line Items]    
2019 2,583  
2020 1,291  
2021 (2,138)  
2022 (2,713)  
2023 (2,023)  
Thereafter (6,129)  
Total outstanding debt $ (9,129)