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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Weighted-average assumptions
The weighted-average fair value of employee stock options granted during the years ended December 31, 2015, 2014 and 2013 was $4.87, $7.86 and $6.00, respectively, using the following weighted-average assumptions:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Risk free interest rate
1.66
%
 
1.57
%
 
0.93
%
Expected term
5 years

 
5 years

 
5 years

Volatility
36
%
 
38
%
 
44
%
Dividend yield
1.64
%
 
—
%
 
—
%
Summary of information with respect to common stock option awards
The following table summarizes information with respect to common stock option awards outstanding as of December 31, 2015 and stock option activity during the fiscal year then ended:
 
Number of
Options
 
Weighted
Average
Exercise Price
 
Weighted Average Remaining Contractual Term (years)
 
Aggregate
Intrinsic Value (millions)
Outstanding at December 31, 2014
2,403,850

 
$
17.34

 
7.3
 
$
5.9

Granted
593,976

 
$
16.33

 
 
 
 
Exercised
(27,021
)
 
$
16.32

 
 
 
 
Forfeited
(268,200
)
 
$
18.92

 
 
 
 
Outstanding at December 31, 2015
2,702,605

 
$
17.07

 
6.8
 
$
—

Exercisable at December 31, 2015
2,032,116

 
$
16.70

 
6.3
 
$
—

Expected to vest at December 31, 2015
651,416

 
$
18.20

 
8.5
 
$
—
Summary of information with respect to RSUs
The following table summarizes information with respect to RSUs outstanding as of December 31, 2015 and RSU activity during the fiscal year then ended:
 
Number of
RSUs
 
Weighted
Average Grant-
Date Fair Value
Nonvested at December 31, 2014
479,673

 
$
18.77

Granted
297,514

 
$
14.51

Vested
(248,255
)
 
$
18.00

Forfeited
(44,808
)
 
$
19.43

Nonvested at December 31, 2015
484,124

 
$
16.48
Summary of information with respect to PSUs
The following table summarizes information with respect to unearned PSUs outstanding as of December 31, 2015 and PSU activity during the fiscal year then ended:
 
Number of
PSUs
 
Weighted
Average Grant-
Date Fair Value
Nonvested at December 31, 2014
161,438

 
$
22.63

Granted
134,271

 
$
17.58

Vested
—

 
$
—

Forfeited
(41,057
)
 
$
18.71

Nonvested at December 31, 2015
254,652

 
$
20.14