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Incentive Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019.
Number of UnitsWeighted-Average Grant-Date Fair Value per Unit
Unvested at December 31, 20181,334,016  $17.29  
Granted496,316  17.09  
Vested(778,956) 16.64  
Converted—  —  
Forfeited(13,117) 17.49  
Unvested at December 31, 20191,038,259  17.67  
Summary of Information about Performance Units
The following table summarizes information about performance units for the year ended December 31, 2019.
 
Performance unitsNumber of Units
Weighted-Average Grant-Date
Fair Value per Unit
Unvested at December 31, 20181,811,810  $15.94  
Granted1
953,638  16.84  
Vested(1,378,188) 14.83  
Forfeited(18,178) 17.63  
Unvested at December 31, 20191,369,082  17.66  
1  Includes 457,322 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, 2019, 2018, and 2017.
 Year Ended December 31,
Incentive compensation expense201920182017
 (In thousands)
Cash — short and long-term incentive plan$5,593  $9,301  $4,373  
Equity-based compensation — restricted common and subordinated units10,751  13,624  13,476  
Equity-based compensation — restricted performance units7,386  14,188  17,367  
Board of Directors incentive plan2,347  2,322  2,202  
Total incentive compensation expense$26,077  $39,435  $37,418