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Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
The following table presents a summary of restricted stock transactions during the year ended December 31, 2019:
 
TRSAs
 
PRSUs
 
 
 
Weighted
 
 
 
Weighted
 
 
 
Average
 
 
 
Average
 
Number
 
Grant Date
 
Number
 
Grant Date
 
of
 
Fair Value
 
of
 
Fair Value
Year Ended December 31, 2019
Shares
 
(Per Share)
 
Units
 
(Per Unit)
Unvested restricted stock, beginning of year
1,344,656

 
$47.43
 
325,741

 
$43.34
Granted
836,326

 
$38.66
 
112,815

 
$39.56
Vested
(471,798
)
 
$44.12
 
(106,008
)
 
$32.01
Forfeited
(195,987
)
 
$46.91
 
(56,162
)
 
$23.04
Unvested restricted stock, end of year
1,513,197

 
$43.68
 
276,386

 
$50.27