Incentive Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

Summary of Information about Restricted Units

The following table summarizes information about restricted units for the year ended December 31, 2017.

	Units				Weighted-Average Grant-Date Fair Value per Unit
	Common		Subordinated		Common		Subordinated
Unvested at December 31, 2016	1,271,215		163,041		$	15.29	$	18.97
Granted	901,910		—		18.48		—
Vested	(602,764	)	(103,912	)	15.13		19.35
Converted	—		—		—		—
Forfeited	(28,303	)	—		17.64		—
Unvested at December 31, 2017	1,542,058		59,129		16.72		18.30

Summary of Information about Performance Units

The following table summarizes information about performance units for the year ended December 31, 2017.

Performance units	Number of Units		Weighted-Average Grant-Date Fair Value per Unit
Unvested at December 31, 2016	1,156,419		$	14.94
Granted	438,288		17.99
Vested	—		—
Forfeited	(137,351	)	18.60
Unvested at December 31, 2017	1,457,356		15.51

Summary of Incentive Compensation Expense

The table below summarizes incentive compensation expense recorded in general and administrative expenses in the consolidated statements of operations for the years ended December 31, 2017, 2016, and 2015.

	Year Ended December 31,
Incentive compensation expense	2017		2016		2015
	(In thousands)
Cash — long-term incentive plan	$	1,412	$	2,725	$	15,064
Equity-based compensation — restricted common and subordinated units	13,476		13,408		10,137
Equity-based compensation — restricted performance units	17,367		18,518		4,743
Board of Directors incentive plan	2,202		2,012		3,120
Total incentive compensation expense	$	34,457	$	36,663	$	33,064