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Shareholders' Equity / Partners' Capital - Restricted Stock Units (Details) - Restricted stock units - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Restricted stock units at beginning of period (in shares) 243,875 130,150 91,650
Units awarded (in shares) 304,400 174,400 74,100
Units vested (in shares) (80,125) (42,475) (27,250)
Units forfeited (in shares) (95,775) (18,200) (8,350)
Restricted stock units at end of period (in shares 372,375 243,875 130,150