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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The calculated fair value of options granted and major assumptions used in the model at the date of grant are listed below for the six months ended June 30, 2015:
 
Stock Option Assumptions
Weighted-average grant-date fair value of awards granted during the period
$
6.82

Weighted-average risk-free interest rate
1.38
%
Weighted-average expected price volatility
36.8
%
Expected dividend yield
0.37
%
Expected term in years at the date of grant
4.5
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock option transactions under the terms of the LTSIP are summarized below:
 
Options
Outstanding
 
Weighted-
Average Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
 
 
 
(per share)
 
(in years)
 
(in millions)
Outstanding at December 31, 2014
1,996,215

 
$
28.60

 
 
 
 
Granted
425,877

 
21.69

 
 
 
 
Exercised
(15,000
)
 
19.37

 
 
 
 
Forfeited
(2,817
)
 
31.31

 
 
 
 
Canceled
(60,000
)
 
27.84

 
 
 
 
Outstanding at June 30, 2015
2,344,275

 
$
27.42

 
3.48
 
$
—

Options Exercisable at June 30, 2015
1,658,563

 
$
28.32

 
2.40
 
$
—

Unvested Options at June 30, 2015
685,712

 
$
25.23

 
6.12
 
$
—
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Transactions involving restricted shares under the terms of the LTSIP are summarized below:
 
Restricted Shares
Outstanding
 
Weighted-
Average Grant-Date Fair Value
 
 
 
(per share)
Unvested balance at December 31, 2014
1,426,453

 
$
31.02

Granted
1,373,300

 
21.66

Vested
(585,611
)
 
30.88

Forfeited
(83,590
)
 
27.54

Unvested balance at June 30, 2015
2,130,552

 
$
25.16
Schedule of Other Share-based Compensation, Activity [Table Text Block]
Transactions involving performance share units under the terms of the CIP are summarized below:
 
Performance Share
Units Outstanding
 
Weighted-
Average Grant-Date Fair Value
Unvested balance at December 31, 2014
552,209

 
$
30.85

Granted
234,085

 
21.69

Vested and paid out
(131,665
)
 
30.77

Canceled (1)
(14,612
)
 
30.77

Forfeited
(6,792
)
 
28.29

Unvested balance at June 30, 2015
633,225

 
$
27.52


____________________________
(1) 
Represents units that were not paid out due to performance under the plan.