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Borrowings (Scheduled Principal Repayments on Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 363,505  
2022 366,144  
2023 360,392  
2024 417,172  
2025 403,018  
Thereafter 2,652,481  
Total Outstanding Debt 4,562,712 $ 4,454,598
Maturities    
Debt Instrument [Line Items]    
2021 363,578  
2022 367,000  
2023 362,250  
2024 420,000  
2025 406,588  
Thereafter 2,663,293  
Total Outstanding Debt 4,582,709  
Amortization Other [Member]    
Debt Instrument [Line Items]    
2021 (73)  
2022 (856)  
2023 (1,858)  
2024 (2,828)  
2025 (3,570)  
Thereafter (10,812)  
Total Outstanding Debt $ (19,997)