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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Leases [Abstract]        
Rent expense $ 1.5 $ 1.6 $ 3.1 $ 3.1