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Equity-based Compensation Plan (Narratives) (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Based Arrangements To Obtain Goods And Services [Abstract]      
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 1 year 9 months    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized $ 2.3    
Number of options - Options granted 0 0 0