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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2018
Sep. 30, 2015
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]      
Loss contingency, damages sought, value   $ 9.8  
Litigation settlement date     April 2018
Litigation final settlement amount $ 6.0