Incentive Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of Information about Restricted Units

The following table summarizes information about restricted units for the year ended December 31, 2020.

	Number of Units	Weighted-Average Grant-Date Fair Value per Unit
Unvested at December 31, 2019	1,038,259	$	17.67
Granted	298,279	9.97
Vested	(569,916)	17.93
Forfeited	(172,632)	17.35
Unvested at December 31, 2020	593,990	13.65

Summary of Information about Performance Units

The following table summarizes information about performance units for the year ended December 31, 2020. 

Performance units	Number of Units	Weighted-Average Grant-Date Fair Value per Unit
Unvested at December 31, 2019	1,369,082	$	17.66
Granted1	340,036	10.95
Vested	(660,276)	17.88
Forfeited	(166,532)	17.35
Unvested at December 31, 2020	882,310	14.96

1  Includes 41,757 of additional performance units issued based on the final performance multiplier for awards that vested in the period.

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, 2020, 2019, and 2018.

	Year Ended December 31,
Incentive compensation expense	2020		2019		2018
	(In thousands)
Cash — short and long-term incentive plan	$	2,962	$	5,593	$	9,301
Equity-based compensation — restricted common and subordinated units	4,688		10,751		13,624
Equity-based compensation — restricted performance units	(2,417)		7,386		14,188
Board of Directors incentive plan	1,456		2,347		2,322
Total incentive compensation expense	$	6,689	$	26,077	$	39,435