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Commitments and Contingencies (Schedule of Annual Operating Lease Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 8,445
2020 6,440
2021 4,362
2022 3,265
2023 1,894
Thereafter 593
Total operating lease payments $ 24,999