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Commitments and Contingencies (Schedule of Rent Expense under Operating Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 12,571 $ 11,964 $ 13,652