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Equity-based compensation Plan (Equity-Based Compensation Plan) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]      
Number of options - Beginning of period 739,326 845,619 917,269
Number of options - Options granted 0 0 0
Number of options - Options exercises 105,032 101,268 71,150
Number of options - Options forfeited 0 5,025 500
Number of options - End of period 634,294 739,326 845,619
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward      
Weighted Average Exercise Price - Beginning of period $ 14.28 $ 14.14 $ 14.08
Weighted Average Exercise Price - Options granted 0 0 0
Weighted Average Exercise Price - Options exercises 12.32 13.41 12.96
Weighted Average Exercise Price - Options forfeited 0 17.08 15.23
Weighted Average Exercise Price - End of period $ 14.6 $ 14.28 $ 14.14