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Equity Incentive Plan (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Share Awards
A summary of the Company’s restricted share awards for the six months ended June 30, 2019 and the year ended December 31, 2018 is as follows:
Six Months EndedYear Ended
June 30, 2019December 31, 2018
Number of SharesWeighted-Average Grant Date Fair ValueNumber of SharesWeighted-Average Grant Date Fair Value
Non-vested at beginning of the period8,334 $18.52 57,514 $23.78 
Granted— — 5,000 17.40 
Vested(1,667)20.20 (30,084)26.24 
Forfeited— — (24,096)21.21 
Non-vested at end of the period6,667 $18.10 8,334 $18.52 
Schedule of Long Term Incentive Unit Awards
A summary of the Company's LTIP Unit awards for the six months ended June 30, 2019 and the year ended December 31, 2018 is as follows:
Six Months EndedYear Ended
June 30, 2019December 31, 2018
Number of UnitsWeighted-Average Grant Date Fair ValueNumber of UnitsWeighted-Average Grant Date Fair Value
Non-vested at beginning of the period476,398 $17.73 482,056 $16.58 
Granted221,853 18.73 244,917 16.94 
Vested(99,931)16.55 (67,275)16.42 
Forfeited— $— (183,300)$14.13 
Non-vested at end of the period598,320 $18.30 476,398 $17.73 
Schedule of Performance-Based Long-Term Incentive Plan Payout Unit Awards The 2019 Performance-Based LTIP Unit Awards, if earned, will be paid out between 50% and 150% of target value as follows:
Relative TSR Hurdles (Percentile)Payout Percentage
Threshold25th  50%  
Target50th  100%  
Maximum75th  150%  
Schedule of Share-based Payment Award, Valuation Assumptions
The grant date fair values of the LTIPs and the assumptions used to estimate the values are as follows:

Grant DateNumber of Units GrantedEstimated Value Per UnitVolatilityDividend YieldRisk Free Interest Rate
Outperformance Plan LTIP Unit Awards6/1/2015183,300 $14.13 26%  4.5%  0.95%  
2016 Time-Based LTIP Unit Awards1/28/201672,966 $16.69 28%  —%  0.79%  
2016 Performance-Based LTIP Unit Awards1/28/201639,285 $11.09 30%  5.8%  1.13%  
2017 Time-Based LTIP Unit Awards3/1/201789,574 $18.53 24%  —%  0.92%  
2017 Performance-Based LTIP Unit Awards3/1/2017134,348 $19.65 25%  5.8%  1.47%  
2018 Time-Based LTIP Unit Awards3/1/201897,968 $16.83 26%  —%  2.07%  
2018 Performance-Based LTIP Unit Awards3/1/2018146,949 $17.02 26%  6.2%  2.37%  
2019 Time-Based LTIP Unit Awards3/1/201988,746 $18.45 21%  —%  2.57%  
2019 Performance-Based LTIP Unit Awards3/1/2019133,107 $18.91 21%  6.2%  2.55%