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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Stock-Based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] The following table summarizes our restricted stock award activity for the years ended December 31, 2019, 2018 and 2017. The vesting dates for the awards vested in 2019 occurred relatively evenly throughout the year ended December 31, 2019. The fair value of awards vested during 2019, 2018 and 2017 was $1.8 million, $0.8 million and $0.6 million, respectively.
2019
Number of Restricted Stock Awards ( in thousands)Weighted Average Grant Date Fair Value
Unvested at January 126.5  $21.31  
Granted114.0  19.88  
Vested(87.9) 19.93  
Forfeited(0.5) 17.11  
Outstanding (unvested) at end of year52.1  $20.55  

2018
Number of Restricted Stock Awards ( in thousands)Weighted Average Grant Date Fair Value
Unvested at January 153.7  $21.82  
Granted10.0  18.58  
Vested(35.7) 21.48  
Forfeited(1.5) 17.11  
Outstanding (unvested) at end of year26.5  $21.31  

2017
Number of Restricted Stock Awards (in thousands)Weighted Average Grant Date Fair Value
Unvested at beginning of year53.0  $21.53  
Granted27.0  22.98  
Vested(25.3) 22.07  
Forfeited(1.0) 17.11  
Outstanding (unvested) at end of year53.7  $21.82