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Equity-based Compensation Plan (Summary of the restricted units' activity under the Omnibus Plan) (Details) - OmnibusPlan [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]      
Restricted units - Beginning of period 254,050 105,800 59,800
Restricted units granted 125,100 176,250 83,000
Restricted units lapsed 0 (24,017) (33,100)
Restricted stock forfeited 0 (3,983) (3,900)
Restricted units - End of period 379,150 254,050 105,800
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted average grant date - Beginning Of Period $ 12.5 $ 14.19 $ 16.64
Weighted average grant date - Granted 21.36 12.12 13.31
Weighted average grant date - Lapsed 0 17.12 16.1
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value 0 12.48 16.79
Weighted average grant date - End Of Period $ 15.32 $ 12.5 $ 14.19