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Commitments, Contingencies and Guarantees (Schedule of Minimum Annual Rental Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 19,351
2020 17,109
2021 14,528
2022 10,799
2023 8,518
Thereafter 36,514
Total minimum annual rental payments $ 106,819