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STOCK-BASED AWARDS (Tables)

6 Months Ended

Jun. 30, 2020

Stock option activity is summarized as follows (in thousands, except per share and term information):


	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value¹
Outstanding, December 31, 2019	2,851	$	30.97	3.1	$	78,580

Exercised	(704)	11.58
Forfeited	(162)	41.94
Outstanding, June 30, 2020	1,985	$	36.96	3.1	$	12,688

Exercisable at June 30, 2020	1,985	$	36.96	3.1	$	12,688
Vested and expected to vest at June 30, 2020	1,985	$	36.96	3.1	$	12,688


¹Based on the Company’s closing stock price of $38.56 on June 30, 2020 and $58.55 on December 31, 2019.

Restricted stock unit (“RSU”) activity is summarized as follows (shares in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Unvested shares at December 31, 2019	3,756	$	47.76
Granted	1,943	34.29
Forfeited	(131)	50.02
Vested	(1,078)	43.80
Unvested shares at June 30, 2020	4,490	$	42.81

Performance-based restricted stock unit (“PRSU”) activity is summarized as follows (shares in thousands):


	Number of Shares	Weighted- Average Grant Date Fair Value
Unvested shares at December 31, 2019¹	1,752	$	44.21
Granted	720	36.06


Unvested shares at June 30, 2020¹	2,472	$	41.83
¹ Assumes maximum achievement of the specified financial targets.

Stock-based compensation expense is reflected in the accompanying condensed consolidated statements of operations as follows (in thousands):