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Equity Incentive Compensation Plans and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock options or units activity
The following table summarizes stock option activity under the predecessor’s Equity Incentive Plans for the period from January 1, 2013 through December 16, 2013, and for the year ended December 31, 2012:
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic Value
(in thousands) (1)
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
 
 
 
 
 
 
 
Outstanding at December 31, 2011
1,520,689

 
30.32

 
17,798

 
 
Granted
82,262

 
53.02

 
 

 
 
Exercised
(215,359
)
 
17.12

 
7,194

 
 
Outstanding at December 31, 2012
1,387,592

 
33.71

 
4,681

 
 
Exercised
(57,350
)
 
12.74

 
2,066

 
 
Outstanding at December 16, 2013
1,330,242

 
$
34.61

 
$
19,243

 
3.21
Vested and expected to vest at December 16, 2013
1,328,771

 
$
34.60

 
$
19,243

 
3.21
Exercisable at December 16, 2013
1,224,022

 
$
33.18

 
$
19,229

 
2.81
(1) 
The intrinsic value of a stock option is the amount by which the market value of the underlying stock at the end of the related period exceeds the exercise price of the option.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The key assumptions used in computing the weighted average fair market value of stock options granted were as follows:
 
2012
 
 
Expected volatility
50.00%
Risk-free rate
0.95%
Dividend yield
0.57%
Expected term (in years)
5.2
Schedule of Range of Exercise Prices
The following table summarizes information about stock options at December 16, 2013:
 
 
Stock Options Outstanding
 
Stock Options Exercisable
Range of Exercise Prices
 
Number of
Options
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Weighted
Average
Exercise
Price
 
Number
of Options
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Weighted
Average
Exercise
Price
 
 
 
 
 
 
 
 
 
 
 
 
 
$21.58-$21.77
 
240,000

 
0.90
 
$
21.60

 
240,000

 
0.90
 
$
21.60

$30.65-$32.57
 
639,000

 
2.50
 
31.70

 
639,000

 
2.50
 
31.70

$38.00-$53.02
 
451,242

 
5.43
 
45.66

 
345,022

 
4.71
 
43.98

 
 
1,330,242

 
3.21
 
$
34.61

 
1,224,022

 
2.81
 
$
33.18
Summary of restricted stock units activity
The following table summarizes RSU activity under the predecessor’s Equity Incentive Plans for the period from January 1, 2013 through December 16, 2013, and for the year ended December 31, 2012:
 
RSUs
 
Weighted Average
Intrinsic Value at
Grant Date
 
Vest Date Fair
Value
(in thousands)
 
 
 
 
 
 
Outstanding at December 31, 2011
915,022

 
$
23.88

 
 

Granted
164,112

 
50.60

 
 

Issued
(79,068
)
 
33.10

 
$
3,401

Canceled/expired
(18,189
)
 
41.50

 
 

December 31, 2012
981,877

 
$
26.72

 
 

Granted
286,344

 
45.51

 
 

Issued
(853,169
)
 
23.94

 
$
39,513

Canceled/expired
(22,511
)
 
44.69

 
 

Outstanding at December 16, 2013
392,541

 
$
46.86

 
 
Summary of performance share awards activity
The following table summarizes performance share award activity under the predecessor’s Equity Incentive Plans for the period from January 1, 2013 through December 16, 2013, and for the year ended December 31, 2012:
 
Performance Share Awards
 
Weighted Average
Grant Date
Fair Value
 
Vest Date Fair
Value
(in thousands)
 
 
 
 
 
 
Outstanding at December 31, 2011
162,849

 
$
39.00

 
 

Granted
59,738

 
63.69

 
 

Outstanding at December 31, 2012
222,587

 
$
45.79

 
 

Issued
(135,167
)
 
44.33

 
$
6,308

Canceled/expired
(87,420
)
 
44.42

 
 

Outstanding at December 16, 2013
—

 
$
—

 
 
Schedule of Market Based Restricted Shares Using Monte Carlo Model Valuation Assumptions
The key assumptions used in valuing the market-based portion of the performance share awards were as follows:
 
2012
 
 
Number of simulations
100,000
Expected volatility
50%
Risk-free rate
0.42%