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Equity Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The table below provides the assumptions used in estimating the fair values of our outstanding PRSUs under the Plan. For all awards granted, we calculated volatility using historical volatility and implied volatility of a peer group of public companies using weekly stock prices.
 
2018 Grants
 
2017 Grants
 
2016 Grants
Expected volatility
36.11%-44.66%

 
44.03%-46.54%

 
41.77
%
Expected term
2.06-2.81

 
2.06-3.06

 
2.81

Risk free rate
2.40%-2.73%

 
1.43%-1.93%

 
1.08
%
Fair value per share
$
57.93

 
$
37.80

 
$
14.31

The table below provides the assumptions used in estimating the fair values of our outstanding stock options and SARs under the Incentive Plans. For all awards granted, we calculated volatility using historical volatility and implied volatility of a peer group of public companies using weekly stock prices.
 
 
2018 Grants
 
2017 Grants
 
2016 Grants
 
 
(Graded Vesting)
 
(Graded Vesting)
 
(Graded Vesting)
 
 
4 years
 
4 years
 
4 years
Expected volatility
 
47.52%-49.42%
 
47.49%-49.18%
 
51.31%-54.12%
Dividend yield
 
2.00%-2.33%
 
2.41%-3.72%
 
1.84%-3.72%
Expected term
 
4.38-4.62 years
 
4.37-4.82 years
 
4.75-4.87 years
Risk free rate
 
1.56%-2.92%
 
0.60%-2.58%
 
0.18%-2.47%
Fair value per share
 
$
15.00

 
$
8.08

 
$
5.67
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity The following table summarizes the stock option and SAR activity under the Incentive Plans for the years ended December 31, 2018, 2017 and 2016:
 
 
Number of Options
 
Weighted-Average Strike Price
 
Weighted-Average Contractual Term (in years)
 
Average Intrinsic Value
(in millions)
Options outstanding, December 31, 2015
3,032,143

 
$
28.60

 
 
 
 
Granted
 
347,800

 
$
16.26

 
 
 
 
Exercised
 
(68,510
)
 
$
14.69

 
 
 
 
Forfeited
 
(743,050
)
 
$
31.17

 
 
 
 
Options and SARs outstanding, December 31, 2016
2,568,383

 
$
26.56

 
 
 
 
Granted
 
2,460,500

 
$
25.95

 
 
 
 
Exercised
 
(303,049
)
 
$
17.04

 
 
 
 
Forfeited
 
(534,827
)
 
$
28.00

 
 
 
 
Options and SARs outstanding, December 31, 2017
4,191,007

 
$
26.71

 
 
 
 
Granted
 
1,497,400

 
$
43.49

 
 
 
 
Exercised
 
(1,286,527
)
 
$
30.55

 
 
 
 
Forfeited
 
(827,775
)
 
$
29.01

 
 
 
 
Options and SARs outstanding, December 31, 2018
3,574,105

 
$
32.67

 
8.4
 
$
42.7

Vested options and SARs exercisable, December 31, 2018
768,955

 
$
26.40

 
6.7
 
$
4.7
Schedule of Share-based Compensation, Restricted Stock Units Award Activity The following table summarizes the RSU and PRSU activity under the Incentive Plans for the years ended December 31, 2018, 2017 and 2016:
 
 
Number of RSUs
 
Weighted-Average Grant Date Price
Balance
December 31, 2015
384,567

 
$
33.6

Granted
 
858,296

 
$
12.94

Vested
 
(246,657
)
 
$
21.17

Forfeited
 
(114,393
)
 
$
17.23

Balance
December 31, 2016
881,813

 
$
19.08

Granted
 
614,035

 
$
31.56

Vested
 
(351,713
)
 
$
21.95

Forfeited
 
(78,676
)
 
$
13.44

Performance Not Achieved
 
(5,789
)
 
$
38.03

Balance
December 31, 2017
1,059,670

 
$
25.68

Granted
 
440,896

 
$
53.10

Vested
 
(341,774
)
 
$
25.62

Forfeited
 
(154,780
)
 
$
36.96

Balance
December 31, 2018
1,004,012

 
$
36.00