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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Allocated Share-based Compensation Expense
The Company recognized the following stock-based compensation expense in direct operating expense and sales, general and administrative expense in the consolidated statements of operations:
 
Years ended December 31,
(Dollars in millions)
2015
 
2014
 
2013
Stock options
$
1.9

 
$
1.7

 
$
1.5

Stock appreciation rights
0.4

 
—

 
—

Restricted stock units
9.0

 
5.8

 
3.2

Performance-based restricted stock units
17.0

 
—

 
—

Warrants
8.5

 
—

 
—

Stock-based compensation expense
$
36.8

 
$
7.5

 
$
4.7
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Valuation Assumptions
The following is a summary of the weighted-average assumptions used to calculate the grant-date fair value using the Black-Scholes option pricing model:

2015
 
2014
 
2013
Weighted-average risk-free interest rate
1.6
%
 
1.9
%
 
1.6
%
Weighted-average volatility
60.7
%
 
50.5
%
 
51.0
%
Weighted-average dividend yield
—

 
—

 
—

Weighted-average expected option term (in years)
6.61

 
6.44

 
6.44
Equity Awards Outstanding and Exercisable
A summary of stock option award activity for the years ended December 31, 2015, 2014 and 2013 is presented below:  
 
 Stock Options
 
Number of Stock Options
 
Weighted-Average Exercise Price
 
Exercise Price Range
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Term
 
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2012
1,383,332

 
$
10.06

 
$2.28 - $18.07
 
$
5.50

 
8.29
Granted
111,000

 
20.18

 
$16.57 - $23.19
 
10.13

 
 
Exercised
(57,464
)
 
4.59

 
$2.96 - $6.08
 
11.62

 
 
Forfeited
(15,348
)
 
14.25

 
$6.08 - $16.57
 
6.99

 
 
Outstanding at December 31, 2013
1,421,520

 
$
11.02

 
$2.28 - $23.19
 
$
6.01

 
6.93
Granted
50,000

 
27.48

 
$23.31 - $31.28
 
14.37

 
 
Exercised
(74,531
)
 
6.83

 
$2.96 - $17.10
 
18.43

 
 
Forfeited
(52,194
)
 
15.21

 
$10.53 - $31.28
 
7.50

 
 
Outstanding at December 31, 2014
1,344,795

 
$
11.70

 
$2.68 - $27.87
 
$
6.04

 
6.84
Granted
85,755

 
26.72

 
$26.63 - $27.47
 
15.71

 
 
Assumed
883,733

 
24.17

 
$10.94 - $31.88
 
5.71

 
 
Exercised
(271,703
)
 
19.20

 
$2.68 - $29.79
 
4.85

 
 
Forfeited
(38,300
)
 
20.51

 
$12.10 - $27.87
 
9.80

 
 
Outstanding at December 31, 2015
2,004,280

 
$
16.66

 
$2.68 - $31.88
 
$
6.06

 
4.57
Options exercisable at December 31, 2015
1,680,525

 
$
16.62

 
$2.68 - $31.88
 
$
5.49

 
4.05
Schedule of Estimated Remaining Share Based Compensation Expense
The remaining estimated compensation expense related to existing stock options is as follows:
 
Years ended December 31,
(Dollars in millions)
2016

2017

2018

2019

2020
Remaining estimated compensation expense related to existing stock options
$
1.2


$
0.6


$
0.4


$
0.1


$
—
Stock appreciation rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity Awards Outstanding and Exercisable
The following table summarizes SAR activity for 2015:
 
 Stock Appreciation Rights
 
Number of Rights
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Term
 
 
 
 
 
 
Outstanding at December 31, 2014
—

 
$
—

 
—
Granted
—

 
—

 
—
Assumed
180,789

 
15.61

 
—
Exercised
(37,186
)
 
15.61

 
—
Forfeited
—

 
—

 
—
Outstanding at December 31, 2015
143,603

 
$
15.61

 
1.79
SARs exercisable at December 31, 2015
143,603

 
$
15.61

 
1.79
Restricted Stock Units and Performance-based Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Valuation Assumptions
The fair value of all grants of RSUs and PRSUs subject to market-based vesting conditions was estimated using the Monte Carlo simulation lattice model and the assumptions noted in the following table.
 
2015
 
2014
 
2013
Weighted-average risk-free interest rate
1.1
%
 
1.2
%
 
1.0
%
Weighted-average volatility
41.1
%
 
44.3
%
 
50.0
%
Weighted-average dividend yield
—

 
—

 
—

Weighted-average term (in years)
2.98

 
3.59

 
3.78
Equity Awards Outstanding and Exercisable
A summary of RSU and PRSU award activity for the years ended December 31, 2015, 2014 and 2013 is presented below:
 
Restricted Stock Units
 
Performance-based Restricted Stock Units
 
Number of Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
 
Number of Performance-based Restricted
Stock Units
 
Weighted-Average Grant Date Fair Value
 
 
 
 
 
 
 
 
Outstanding at December 31, 2012
883,816

 
$
11.31

 
—

 
$
—

Granted
305,714

 
14.38

 
450,000

 
15.15

Vested
(219,875
)
 
11.64

 
—

 
—

Forfeited
(68,000
)
 
10.65

 
—

 
—

Outstanding at December 31, 2013
901,655

 
$
13.26

 
450,000

 
$
13.26

Granted
175,773

 
29.81

 
1,114,951

 
23.19

Vested
(295,600
)
 
14.98

 
—

 
—

Forfeited
(89,005
)
 
14.94

 
(1,000
)
 
27.61

Outstanding at December 31, 2014
692,823

 
$
15.23

 
1,563,951

 
$
20.86

Granted
329,899

 
25.72

 
537,261

 
24.75

Assumed
1,088,674

 
26.02

 
—

 
—

Vested
(460,895
)
 
19.47

 
(25,424
)
 
31.02

Forfeited
(92,060
)
 
27.24

 
(88,728
)
 
28.15

Outstanding at December 31, 2015
1,558,441

 
$
23.01

 
1,987,060

 
$
21.47
Schedule of Estimated Remaining Share Based Compensation Expense
Remaining estimated compensation expense related to outstanding RSUs and PRSUs is as follows:
 
Years ended December 31,
(Dollars in millions)
2016
 
2017
 
2018
 
2019
 
2020 and thereafter
Remaining estimated compensation expense related to outstanding RSUs and PRSUs deemed probable
$
13.1

 
$
7.2

 
$
3.1

 
$
0.6

 
$
0.9