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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information on stock options issued The following table contains information about our stock options:
 
Number of Option
Shares
 
Weighted-Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding as of January 1, 2018
6,551,314

 
$
12.29

 
 
 
 

Granted
663,343

 
$
30.75

 
 
 
 

Exercised
(1,302,501
)
 
$
8.70

 
 
 
 

Forfeited
(42,945
)
 
$
16.67

 
 
 
 

Outstanding as of December 31, 2018
5,869,211

 
$
15.14

 
3.97
 
$
28,470

Exercisable as of December 31, 2018
3,099,460

 
$
12.83

 
3.25
 
$
17,992
Information about stock options by exercise price range The following table summarizes information about our outstanding stock options as of December 31, 2018:
 
Exercise Price Range
 
Total
 
$8.88 to
$13.35
 
$13.50 to
$20.52
 
$20.75 to
$32.90
 
$8.88 to
$32.90
Outstanding options
 
 
 
 
 
 
 
Number outstanding
3,637,366

 
1,570,183

 
661,662

 
5,869,211

Weighted-average remaining contractual life (years)
3.22

 
4.87

 
6.01

 
3.97

Weighted-average exercise price
$
12.65

 
$
14.38

 
$
30.67

 
$
15.14

Exercisable options
 
 
 
 
 
 
 
Number outstanding
2,645,735

 
452,466

 
1,259

 
3,099,460

Weighted-average exercise price
$
12.53

 
$
14.56

 
$
20.75

 
$
12.83
Weighted-average assumptions used in Black-Scholes option pricing model The following are the weighted-average assumptions used in the Black-Scholes option-pricing model for the years ended December 31, 2018, 2017 and 2016:
 
For the year ended December 31,
 
2018
 
2017
 
2016
Risk-free interest rate
2.26
%
 
1.97
%
 
1.20
%
Expected volatility
30.80
%
 
30.66
%
 
31.23
%
Dividend yield
—

 
—

 
—

Weighted-average expected life (in years)
5.30

 
5.30

 
5.40
Information on restricted stock awards restricted stock awards with performance-based vesting conditions under its Performance Share Programs. Additionally, in conjunction with the Pinnacle Acquisition, the Company awarded 129,961 restricted stock awards to new employees of the Company. The following table contains information on our restricted stock awards:
 
Number of 
Shares
 
Weighted Average Grant Date Fair Value
Outstanding as of January 1, 2018
267,655

 
$
13.83

Awarded
333,478

 
$
30.00

Released
(30,979
)
 
$
14.15

Canceled
(11,333
)
 
$
17.96

Outstanding at December 31, 2018
558,821

 
$
23.38