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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity RSU activity for the six months ended June 30, 2019 is as follows:
 
 
Number of Shares
 
Weighted-Average
Grant-Date Fair Value
(in thousands, except weighted-average fair value prices)
 
Unvested RSUs outstanding at December 31, 2018
1,087

 
$
42.04

RSUs granted
629

 
$
36.50

RSUs vested
(513
)
 
$
40.36

RSUs forfeited
(61
)
 
$
40.15

Unvested RSUs outstanding at June 30, 2019
1,142

 
$
39.85
Schedule of Share-based Payment Award, Performance-Based Units, Valuation Assumptions
The fair values of the awards containing market-based vesting conditions were estimated using Monte-Carlo simulation with the following weighted-average assumptions:

 
For the Six Months Ended June 30,
 
2019
 
2018
Expected dividend yield
—
%
 
—
%
Risk-free interest rate (1)
2.44
%
 
2.38
%
Expected volatility (2)
28.24
%
 
23.63
%
Average total stockholder return (2)
17.15
%
 
6.11
%
 
 
 
 
(1) The risk-free interest rate for the periods within the contractual term of the PBRSUs is based on the U.S. Treasury yield curve in effect at the time of the grant.
(2) The expected volatility and average total stockholder return are measures of the amount by which a stock price has fluctuated or is expected to fluctuate based primarily on our and our peers' historical data.
Schedule of Other Share-based Compensation, Activity
PBRSU activity for the six months ended June 30, 2019 is as follows:

 
Number of Shares
 
Weighted-Average
Grant-Date Fair Value
(in thousands, except weighted-average fair value prices)
 
Unvested PBRSUs outstanding at December 31, 2018
774

 
$
42.11

PBRSUs granted
203

 
$
36.82

PBRSUs vested
(250
)
 
$
34.40

PBRSUs forfeited
(100
)
 
$
45.07

Unvested PBRSUs outstanding at June 30, 2019
627

 
$
42.68
Schedule of Share-based Compensation, Stock Options, Activity Option activity for the six months ended June 30, 2019 is as follows:

(in thousands, except weighted-average price)
Number of
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate
Intrinsic
Value
Options outstanding at December 31, 2018
570

 
$
20.17

 
 
 
 
Options exercised
(70
)
 
$
25.24

 
 
 
 
Options vested, exercisable, and outstanding at June 30, 2019
500

 
$
19.46

 
2.8
 
$
11,175
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table sets forth the share-based compensation expense recognized for the three and six months ended June 30, 2019 and 2018:

 
For the Three Months Ended
 
For the Six Months Ended
 
June 30,
 
June 30,
(in thousands)
2019
 
2018
 
2019
 
2018
RSUs
$
5,612

 
$
7,238

 
$
12,924

 
$
14,633

PBRSUs
1,744

 
3,445

 
3,658

 
4,159

Stock options
—

 
—

 
—

 
—

Employee stock purchase plan
507

 
439

 
1,173

 
1,007

 
$
7,863

 
$
11,122

 
$
17,755

 
$
19,799