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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Stock-Based Compensation [Abstract]  
Disclosure of restricted stock award activity
The following tables summarize our restricted stock award activity for the three months ended March 31, 2020 and 2019.

Three Months Ended March 31, 2020
Number of Shares of Restricted Stock Awards (in thousands)Weighted Average Grant Date Fair Value
Unvested at beginning of period  52.1  $20.55  
Granted  60.2  20.84  
Vested  (38.0) 20.86  
Forfeited  (0.5) 19.32  
Outstanding (unvested) at end of period 73.8  $20.66  


Three Months Ended March 31, 2019
Number of Shares of Restricted Stock Awards (in thousands)Weighted Average Grant Date Fair Value
Unvested at beginning of period  26.5  $21.31  
Granted  12.5  20.04  
Vested  (18.5) 21.09  
Forfeited  (0.5) 17.11  
Outstanding (unvested) at end of period 20.0  $20.82