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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]    
Weighted average remaining lease term 31 years 8 months 12 days  
Weighted average discount rate 5.60%  
Rent expense $ 0.4 $ 0.2