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Equity Incentive Plan - Schedule of LTIP unit Awards (Details) - Long Term Incentive Plan Units - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of company's restricted share awards    
Number of Shares, Nonvested at beginning of the period (in shares) 482,056 295,551
Number of shares, granted (in shares) 244,917 223,922
Number of Shares, Vested (in shares) (67,275) (37,417)
Number of Shares, Nonvested at end of the period (in shares) 659,698  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted - Average Grant Date Fair Value, Nonvested at beginning of the period (in dollars per share) $ 16.58 $ 14.36
Weighted - Average Grant Date Fair Value, Granted (in dollars per share) 16.94 19.20
Weighted - Average Grant Date Fair Value, Vested (in dollars per share) 16.42 $ 14.73
Weighted - Average Grant Date Fair Value, Nonvested at end of the period (in dollars per share) $ 20.08