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Compensation Plans Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation Related Costs [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of the status and activity of non-vested RSUs for the nine months ended September 30, 2015, is presented in the following table:

 
RSUs
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
515,724

 
$
68.29

Granted
356,246

 
$
43.72

Vested
(267,244
)
 
$
63.43

Forfeited
(41,330
)
 
$
68.63

Non-vested at end of quarter
563,396

 
$
55.04
Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block]
A summary of the status and activity of non-vested PSUs for the nine months ended September 30, 2015, is presented in the following table:
 
PSUs (1)
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
433,660

 
$
73.63

Granted
320,753

 
$
45.34

Vested
(75,353
)
 
$
51.59

Forfeited
(47,787
)
 
$
74.42

Non-vested at end of quarter
631,273

 
$
61.83

____________________________________________
(1) 
The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.