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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Schedule of calculated fair value of options granted and major assumptions used
The calculated fair value of options granted and major assumptions used in the model at the date of grant are listed below:
 
Stock Option Variables
 
Year Ended December 31,
 
2014
 
2013
 
2012
Weighted-average grant-date fair value of awards granted during the period
$
10.11

 
$
15.16

 
$
14.29

Risk-free interest rate range
1.31% - 1.34%

 
0.97% - 1.84%

 
0.63% - 1.04%

Weighted-average risk-free interest rate
1.3
%
 
1.0
%
 
0.8
%
Expected price volatility range
36.1% - 37.3%

 
51.5% - 58.5%

 
55.9% - 56.5%

Weighted-average expected price volatility
37.1
%
 
58.3
%
 
55.9
%
Expected dividend yield
0.25
%
 
0.27
%
 
0.26
%
Expected term in years at the date of grant
4.5

 
5.5

 
5.0
Summary of stock option transactions under the terms of LTSIP
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, 2013
1,794,187

 
$
27.90

 
 
 
 
Granted
282,236

 
31.67

 
 
 
 
Exercised
(65,366
)
 
22.24

 
 
 
 

Forfeited
(14,842
)
 
30.53

 
 
 
 
Outstanding at December 31, 2014
1,996,215

 
$
28.60

 
3.18
 
$
0.1

Options Exercisable at December 31, 2014
1,494,061

 
$
27.80

 
2.39
 
$
0.1

Unvested Options at December 31, 2014
502,154

 
$
30.98

 
5.51
 
$
—
Restricted Shares and Performance Share Units Activity
Restricted Shares
Restricted share grants typically vest in equal installments over a three-year period from the grant date. The grant date fair value is determined based on the closing bid price of the Company's common stock on the grant date. The total fair value of restricted stock that vested during the years ended December 31, 2014, 2013 and 2012, was $26.8 million, $19.8 million and $16.7 million, respectively. The Company realized an income tax expense of $0.5 million, $0.1 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively. Restricted stock increased the Company's APIC pool by $0.3 million as of December 31, 2014. The weighted average grant-date fair value of restricted stock granted during the years was $31.40 per share, $30.06 per share and $30.54 per share for the years ended December 31, 2014, 2013 and 2012, respectively. As of December 31, 2014, $18.3 million of unrecognized compensation cost related to restricted shares granted under the LTSIP is expected to be recognized over a weighted-average vesting period of 2.10 years.
 
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, 2013
1,388,953

 
$
30.96

Granted
1,033,023

 
31.40

Vested
(855,720
)
 
31.39

Forfeited
(139,803
)
 
31.00

Unvested balance at December 31, 2014
1,426,453

 
$
31.02

 
Performance Share Units
The performance share units' cash payouts are dependent upon the Company's total shareholder return compared to a group of its peers over a three-year period. The awards are denominated in share units but delivered in cash at the end of the performance period. The weighted average grant-date fair values of the performance share units granted during the years ended December 31, 2014, 2013 and 2012, were $31.57, $30.12, and $30.75 per unit, respectively. As of December 31, 2014, $2.3 million of unrecognized compensation cost classified as a liability, or the fair market value, related to performance shares granted under the CIP is expected to be recognized over a weighted-average vesting period of 1.90 years.
 
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, 2013
480,660

 
$
32.33

Granted
256,101

 
31.57

Vested
(73,956
)
 
37.17

Canceled
(83,545
)
 
35.84

Forfeited
(27,051
)
 
30.60

Unvested balance at December 31, 2014
552,209

 
$
30.85