Employee Incentive Plans (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
RSUs and PBRSUs	$	17,696	$	13,975	$	32,439	$	31,681
Stock options	14		229		464		652
Total stock-based compensation expense	$	17,710	$	14,204	$	32,903	$	32,333

Schedule of RSU Activity

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

	Number of Units	Weighted- Average Grant Date Fair Value
Unvested at December 31, 2020	11,395,112	$	11.26
Granted	4,839,092	$	11.42
Vested	(2,525,235)	$	12.11
Forfeited/expired	(1,376,074)	$	11.64
Unvested at June 30, 2021	12,332,895	$	11.10

Schedule of PBRSU Activity

The following table summarizes the activities for the Company’s PBRSUs during the first half 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	(40,565)	$	22.59
Forfeited/expired	(37,626)	$	24.54
Unvested at June 30, 2021	1,931,405	$	9.92