Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Partnership Unit Award Activity Table

	Units		Weighted Average Grant Date Fair Value Per Unit
	(In Thousands)
Nonvested units outstanding at December 31, 2016	609		$	13.41
Units granted(1)	290		8.40
Units cancelled	(173	)	16.11
Units vested	(257	)	13.17
Nonvested units outstanding at December 31, 2017(2)	469		$	9.31

Stock Option Valuation Assumptions Table

	Year Ended December 31,
	2017	2016	2015
Expected stock price volatility	53%	52%	49% to 51%
Expected life of options	4.5 years	4.6 years	4.6 years
Risk free interest rate	1.8%	1.2%	1.41% to 1.51%
Expected dividend yield	—	—	—

Stock Option Award Activity Table

	Shares Under Option		Weighted Average Option Price Per Share		Weighted-Average Remaining Contractual Life	Aggregate Intrinsic Value (in thousands)
	(In Thousands)
Outstanding at January 1, 2017	4,387		$	9.81
Options granted	1,486		4.46
Options cancelled	(646	)	7.34
Options exercised	—		—
Options expired	(10	)	$	14.02
Outstanding at December 31, 2017	5,217		$	8.59	5.7	$	308
Expected to vest at December 31, 2017	5,217		$	8.59	5.7	$	308
Exercisable at December 31, 2017	3,642		$	10.07	4.4	$	239

Intrinsic value is the difference between the market value of our stock option multiplied by the number of stock options outstanding for those stock options where the market value exceeds their exercise price. The total intrinsic value of stock options exercised during December 31, 2017,2016, and2015,wasapproximately $0.0 million, $0.1 million,and $0.2 million, respectively.

Restricted Stock Award Activity Table

	Shares		Weighted Average Grant Date Fair Value Per Share
	(In Thousands)
Nonvested restricted shares outstanding at December 31, 2016	805		$	7.60
Granted	1,146		4.18
Vested	(780	)	6.33
Cancelled/Forfeited	(135	)	5.41
Nonvested restricted shares outstanding at December 31, 2017	1,036		$	5.06