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Employee Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Market and Service Condition Based Restricted Stock Unit Grants  
Schedule of Share-based Payment Award, Restricted Stock Unit, Valuation Assumptions

The average grant date fair value for these RSUs was $22.57 per unit, which was determined using the Monte Carlo simulation model using the following assumptions:

  

Expected volatility (company)

53.9%

 

Expected volatility (peer group median)

28.4%

 

Correlation between the company and peer group median

0.39

 

Expected dividend yield

0.00%

 

Risk-free rate

2.3%