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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity RSU activity for the six months ended June 30, 2020 is as follows:
Number of SharesWeighted-Average
Grant-Date Fair Value
(in thousands, except weighted-average fair value prices)
Unvested RSUs outstanding at 12/31/20191,032  $39.84  
RSUs granted730  $35.39  
RSUs vested(503) $40.40  
RSUs forfeited(34) $33.74  
Unvested RSUs outstanding at 6/30/20201,225  $37.15  
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,
20202019
Expected dividend yield (1)
— %— %
Risk-free interest rate (2)
0.60 %2.44 %
Expected volatility (3)
32.53 %28.24 %
Average total stockholder return (3)
(21.47)%17.15 %
(1) Since PBRSU participants are credited with dividend equivalent shares when dividends are paid, 0.00% was used in the Monte-Carlo simulation which is mathematically equivalent to paying dividend equivalents upon vesting. Please see Note 1 - Basis for Condensed Consolidated Financial Statements for further information regarding dividends.
(2) The risk-free interest rate for the periods within the contractual term of the PBRSUs is based on the US Treasury yield curve in effect at the time of the grant.
(3) 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, 2020 is as follows:
Number of SharesWeighted-Average
Grant-Date Fair Value
(in thousands, except weighted-average fair value prices)
Unvested PBRSUs outstanding at December 31, 2019636  $42.62  
PBRSUs granted296  $37.53  
PBRSUs vested(184) $39.50  
PBRSUs forfeited(12) $43.65  
Unvested PBRSUs outstanding at June 30, 2020736  $41.93  
Schedule of Share-based Compensation, Stock Options, Activity Option activity for the six months ended June 30, 2020 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, 2019479  $19.59    
Options exercised(46) $18.19    
Options outstanding at June 30, 2020433  $19.73  2.1$20,604  
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, 2020 and 2019:
For the Three Months Ended For the Six Months Ended
June 30,June 30,
(in thousands)2020201920202019
RSUs$5,601  $5,612  $11,412  $12,924  
PBRSUs7,363  $1,743  8,938  $3,658  
Stock options—  $—  —  $—  
Employee stock purchase plan789  $508  1,488  $1,173  
 $13,753  $7,863  $21,838  $17,755