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Stock Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Share Based Compensation Restricted Stock Activity A summary of our restricted stock awards from January 1, 2019 to December 31, 2021 is as follows:
Number of
Shares
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2019641,844 $10.25 
Granted162,806 10.38 
Forfeited(21,534)10.37 
Vested(310,117)10.08 
Unvested balance at December 31, 2019472,999 10.40 
Granted344,997 9.39 
Forfeited(22,857)7.73 
Vested(237,866)10.54 
Unvested balance at December 31, 2020557,273 9.83 
Granted1,177,537 9.37 
Forfeited(47,025)9.21 
Vested(244,490)9.94 
Unvested balance at December 31, 20211,443,295 $9.46 
Fair Value Valuation Assumptions The determination of the grant-date fair values of outstanding awards based on our relative total stockholder return included the following assumptions:
Award Grant DateVolatilityRisk-Free RateFair Value at Grant Date
March 2, 201826.9 %2.40 %$9.52 
April 2, 201826.9 %2.37 %$9.00 
March 1, 201924.3 %2.54 %$9.68 
February 25, 202021.4 %1.16 %$8.52 
March 2, 202168.8 %0.26 %$9.28 
Schedule of Nonvested Performance-based Units Activity A summary of our PSUs from January 1, 2019 to December 31, 2021 is as follows:
Number of
Units
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2019781,923 $11.19 
Granted296,050 10.14 
Additional units from dividends40,662 10 
Vested (1)
(251,375)8.8 
Forfeited(70,728)9.93 
Unvested balance at December 31, 2019796,532 11.16 
Granted352,035 9.02 
Additional units from dividends9,556 10.42 
Vested (2)
(245,937)11.00 
Unvested balance at December 31, 2020912,186 9.63 
Granted347,981 9.34 
Vested (3)
(290,927)9.90 
Unvested balance at December 31, 2021969,240 $9.45 
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(1)The number of shares of common stock earned for the PSUs vested in 2019 was equal to 74.33% of the PSU Target Award.
(2)The number of shares of common stock earned for the PSUs vested in 2020 was equal to 123.07% of the PSU Target Award.
(3)The number of shares of common stock earned for the PSUs vested in 2021 was equal to 100.00% of the PSU Target Award.
Summary of LTIP units A summary of our LTIP units from January 1, 2019 to December 31, 2021 is as follows:
Number of
Units
Weighted-
Average Grant
Date Fair
Value
Unvested balance at January 1, 2019— $— 
Granted281,925 10.65
Forfeited(37,559)10.65
Unvested balance at December 31, 2019244,366 10.65 
Granted80,898 9.58
Vested(81,455)10.65
Unvested balance at December 31, 2020243,809 10.29 
Vested(108,421)10.38
Unvested balance at December 31, 2021135,388 $10.22