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Equity Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Share Awards
A summary of the Company’s restricted share awards for the years ended December 31, 2020, 2019 and 2018 is as follows:
 December 31, 2020December 31, 2019December 31, 2018
 
Number of
Shares
Weighted -
Average  Grant
Date Fair
Value
Number of
Shares
Weighted -
Average  Grant
Date Fair
Value
Number of
Shares
Weighted -
Average  Grant
Date Fair
Value
Non-vested at beginning of the period5,001 $18.33 8,334 $18.52 57,514 $23.78 
Granted— — — — 5,000 17.40 
Vested(3,334)18.80 (3,333)18.80 (30,084)26.24 
Forfeited— — — — (24,096)21.21 
Unvested at end of the period1,667 $17.40 5,001 $18.33 8,334 $18.52 
Schedule of Share-based Compensation Arrangements by Share-based Payment Award
A summary of the Company's LTIP unit awards for the years ended years ended December 31, 2020, 2019 and 2018 is as follows:

December 31, 2020December 31, 2019December 31, 2018
Number of
Shares		Weighted -
Average  Grant
Date Fair
Value		Number of
Shares		Weighted -
Average  Grant
Date Fair
Value		Number of
Shares		Weighted -
Average  Grant
Date Fair
Value
Non-vested at beginning of the period598,320 $18.30 476,398 $17.73 482,056 $16.58 
Granted325,507 13.42 221,853 $18.73 244,917 $16.94 
Vested(254,218)18.82 (99,931)$16.55 (67,275)$16.42 
Forfeited— — — $— (183,300)$14.13 
Non-vested at end of period669,609 $15.73 598,320 $18.30 476,398 $17.73 
Schedule of Share-based Payment Award, Performance-Based Long-Term Incentive Plan Payout Unit Awards The 2020 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
Threshold25th50%
Target50th100%
Maximum75th150%
Schedule of Share-based Payment Award, Valuation Assumptions
The grant date fair value 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 Plan6/1/2015183,300$14.1326%4.5%0.95%
2016 Time-Based LTIP Unit Awards1/28/201672,966$16.6928%—%0.79%
2016 Performance-Based LTIP Unit Awards1/28/201639,285$11.0930%5.8%1.13%
2017 Time-Based LTIP Unit Awards3/1/201789,574$18.5324%—%0.92%
2017 Performance-Based LTIP Unit Awards3/1/2017134,348$19.6525%5.8%1.47%
2018 Time-Based LTIP Unit Awards3/1/201897,968$16.8326%—%2.07%
2018 Performance-Based LTIP Unit Awards3/1/2018146,949$17.0226%6.2%2.37%
2019 Time-Based LTIP Unit Awards3/1/201988,746$18.4521%—%2.57%
2019 Performance-Based LTIP Unit Awards3/1/2019133,107$18.9121%6.2%2.55%
2020 Time-Based LTIP Unit Awards3/1/2020130,206$13.0520%—%1.06%
2020 Performance-Based LTIP Unit Awards3/1/2020195,301$13.6620%8.1%0.90%