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Borrowings (Annual Maturities of Notes, Loans and Leases Payable) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Long-term debt, by Maturity:  
2018 $ 496,383
2019 482,569
2020 362,073
2021 564,235
2022 226,771
Thereafter $ 1,387,947