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Borrowings (Annual Maturities of Borrowings) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
All borrowings, repayments of principal, 2019 $ 4,400
All borrowings, repayments of principal, 2020 4,400
All borrowings, repayments of principal, 2021 391,268
All borrowings, repayments of principal, 2022 0
All borrowings, repayments of principal, 2023 0
All borrowings, repayments of principal, thereafter $ 0