Employee Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2021

Postemployment Benefits [Abstract]

Total Stock-based Compensation Expense

Stock-based compensation expense, included in “Compensation and benefits” expense on the Company’s Condensed Consolidated Statements of Operations, was as follows for the periods presented:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
RSUs and PBRSUs	$	16,691	$	14,986	$	49,130	$	46,667
Stock options	118		136		582		788
Total stock-based compensation expense	$	16,809	$	15,122	$	49,712	$	47,455

Schedule of RSU Activity

The following table summarizes the activities for the Company’s RSUs during the first nine months of 2021:

	Number of Units	Weighted- Average Grant Date Fair Value
Unvested at December 31, 2020	11,395,112	$	11.26
Granted	5,494,222	$	13.47
Vested	(3,800,624)	$	12.06
Forfeited/expired	(2,082,511)	$	11.94
Unvested at September 30, 2021	11,006,199	$	11.97

Schedule of PBRSU Activity

The following table summarizes the activities for the Company’s PBRSUs during the first nine months of 2021:

	Number of Units	Weighted- Average Grant Date Fair Value
Unvested at December 31, 2020	1,441,311	$	5.31
Granted	568,285	$	22.54
Vested	(60,848)	$	22.59
Forfeited/expired	(158,123)	$	12.41
Unvested at September 30, 2021	1,790,625	$	9.86