Stock Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

	All Restricted Stock Units
	Units (000)			Wtd. Average Fair Value (per share)
Outstanding December 31, 2016	1,439			$	36.52
Granted	717		(a)	52.73
Vested	(806	)		30.23
Surrendered	(56	)		43.86
Outstanding December 31, 2017	1,294			45.32
Granted	782		(b)	60.80
Vested	(670	)		45.11
Surrendered	(64	)		47.05
Outstanding December 31, 2018, Unvested	1,342			52.56
Granted	994		(c)	57.49
Vested	(744	)		42.42
Surrendered	(47	)		57.72
Outstanding December 31, 2019, Unvested	1,545			57.65

(a) Includes 235 thousand PBRSUs

(b) Includes 308 thousand PBRSUs

(c) Includes 387 thousand PBRSUs

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

The following table provides information about the Company’s ESPP activity during 2019, 2018, and 2017:

Employee Stock Purchase Plan
				(a)
	Total number			Weighted-average
	of shares	Average		fair value of each
	purchased	price paid		purchase right
Year ended	(in thousands)	per share		under the ESPP
December 31, 2017	544	$	50.13	$	5.57
December 31, 2018	661	$	50.73	$	5.64
December 31, 2019	821	$	47.60	$	5.29

(a) The weighted-average fair value of each purchase right under the ESPP granted is equal to a ten percent discount from the market value of the Common Stock at the end of each monthly purchase period.