Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

The compensation cost related to these awards is based on the grant date fair value and is expensed over the vesting period (generally one to five years). We use the Black-Scholes-Merton option pricing model to estimate the fair value of stock option awards with the following assumptions for stock option awards issued during the year ended December 31, 2017:

	Stock Option Valuation Assumptions
Expected Dividend	—
Expected volatility	70.3		%
Risk-free interest rate	1.99		%
Expected life of stock option awards (in years)	5.7
Grant-date market value	$	27.71
Grant-date fair value	$	17.09

Stock option activity

The following table represents stock option award activity for the year ended December 31, 2017:

	Shares		Wtd. Avg. Exer. Price
Options outstanding, beginning of period (successor)	105,811		$	23.25
Options granted	428,974		$	27.71
Options forfeited	(26,055	)	$	26.96
Options canceled	—		$	—
Options exercised	—		$	—
Options outstanding, end of period (successor)	508,730		$	26.82
Options exercisable, end of period (successor)	112,338		$	25.47

Schedule of Nonvested Restricted Stock Units Activity

The following table represents restricted stock unit activity for the year ended December 31, 2017:

	Shares		Wtd. Avg. Grant Price
Restricted units outstanding, beginning of period (successor)	178,847		$	23.25
Restricted stock units granted	326,532		$	28.21
Restricted stock units forfeited	(16,821	)	$	26.41
Restricted stock units vested	(141,818	)	$	25.15
Restricted stock units outstanding, end of period (successor)	346,740		$	26.99