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Compensation Plans Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Performance Share Units Unvested Activity [Table Text Block]
A summary of the status and activity of non-vested PSUs for the nine months ended September 30, 2017, is presented in the following table:
 
PSUs (1)
 
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year
828,923
 
$
43.25

Granted
977,731
 
$
15.86

Vested
(94,338)
 
$
85.85

Forfeited
(168,658)
 
$
46.30

Non-vested at end of quarter
1,543,658
 
$
22.97

____________________________________________
(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 Units Unvested Activity [Table Text Block]
A summary of the status and activity of non-vested RSUs for the nine months ended September 30, 2017, is presented in the following table:
 
RSUs
 
Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year
604,116
 
$
37.39

Granted
1,020,780
 
$
16.64

Vested
(251,575)
 
$
44.00

Forfeited
(102,183)
 
$
28.43

Non-vested at end of quarter
1,271,138
 
$
20.14