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Compensation Plans Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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, 2016, is presented in the following table:
 
PSUs (1)
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
626,328

 
$
61.81

Granted
447,971

 
$
26.56

Vested
(129,422
)
 
$
64.19

Forfeited
(99,414
)
 
$
57.43

Non-vested at end of quarter
845,463

 
$
43.29

____________________________________________
(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.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the status and activity of non-vested RSUs for the nine months ended September 30, 2016, is presented in the following table:

 
RSUs
 
Weighted-Average
 Grant-Date
Fair Value
Non-vested at beginning of year
543,737

 
$
55.01

Granted
417,065

 
$
28.08

Vested
(240,233
)
 
$
58.08

Forfeited
(79,393
)
 
$
46.32

Non-vested at end of quarter
641,176

 
$
37.42