Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Stock-Based Compensation [Abstract]

Stock-Based Award Plan Activity

A summary of the Company’s stock-based award plan activity, including stock options and SARs, for the nine month period ended September 30, 2017 is presented in the following table (underlying shares in thousands):

	Shares			Weighted-Average Exercise Price (per share)
Outstanding at December 31, 2016		13,285		$	8.85
Granted		799		$	20.00
Settled		(92	)	$	8.17
Forfeited		(938	)	$	8.21
Outstanding at September 30, 2017		13,054		$	9.52
Vested at September 30, 2017		6,676		$	8.73

Assumptions Used to Estimate Fair Value of Options Granted

The following assumptions were used to estimate the fair value of options granted during the nine month period ended September 30, 2017 using the Black-Scholes option-pricing model.

	Nine Months Ended September 30, 2017
Assumptions:
Expected life of options (in years)		5.00 - 6.25
Risk-free interest rate		1.94 - 2.12	%
Assumed volatility		41.2 - 45.8	%
Expected dividend rate		0.00	%

Summary of Assumptions Used to Estimate Fair Value of DSUs Granted

The following assumptions were used to estimate the fair value of DSUs at the time of grant using the Finnerty discount for lack of marketability pricing model:

	Nine Months Ended September 30, 2017
Assumptions:
Average length of holding period restrictions (years)		1.42
Assumed volatility		5.15	%