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Equity-based Compensation Plan (Summary of the restricted units' activity under the Omnibus Plan) (Details) - Omnibus Plan [Member] - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]      
Restricted units - Beginning of period 379,150 254,050 105,800
Restricted units granted 257,850 125,100 176,250
Restricted units lapsed (102,525) 0 (24,017)
Restricted stock forfeited (4,705) 0 (3,983)
Restricted units - End of period 529,770 379,150 254,050
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 $ 15.32 $ 12.50 $ 14.19
Weighted average grant date - Granted 16.82 21.36 12.12
Weighted average grant date - Lapsed 14.74 0 17.12
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value 15.93 0 12.48
Weighted average grant date - End Of Period $ 15.58 $ 15.32 $ 12.50