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Stock Based Compensation Plan Stock-based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table presents a summary of restricted stock transactions during the year ended December 31, 2017:
 
TRSAs
 
PRSUs
 
 
 
Weighted
 
 
 
Weighted
 
 
 
Average
 
 
 
Average
 
 
 
Grant Date
 
 
 
Grant Date
 
Number of
 
Fair Value
 
Number of
 
Fair Value
 
Shares
 
(Per Share)
 
Units
 
(Per Unit)
Unvested restricted stock, December 31, 2016
1,476,132

 
$39.83
 
153,715

 
$27.32
Granted
557,955

 
$50.08
 
85,310

 
$57.80
Vested
(498,186
)
 
$40.20
 
—

 
$—
Forfeited
(99,781
)
 
$42.87
 
—

 
$—
Unvested restricted stock, December 31, 2017
1,436,120

 
$43.47
 
239,025

 
$38.20