Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following assumptions were used to determine the grant date fair value of the equity component (February 21, 2018) and the period-end fair value of the liability component of the TSR Performance Share Awards:

	Grant Date			June 30, 2018
Fair value per performance share award	$	19.92		$3.50-$13.45
Assumptions:
Stock price volatility	37.3		%	27.1% - 35.1%
Risk free rate of return	2.40		%	2.10% - 2.56%