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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]        
Rent expense $ 1.6 $ 1.6 $ 4.7 $ 4.7