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Equity-based Compensation Plan (Narratives) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Average Fair Value   $ 5.77 $ 5.77
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 2 years 3 months    
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized $ 1.8