Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Stock-Based Compensation

Schedule of stock option activity

Stock option activity for the year ended December 31, 2018 was as follows:

				Weighted
				Average
		Weighted		Remaining	Aggregate
	Shares Subject	Average		Contractual	Intrinsic Value
	to Options	Option Price		Term (Yrs)	(in millions) (b)
Outstanding at December 31, 2017	3,235,673	$	20.16
Granted	126,260		35.86
Exercised	(575,372)		17.87
Forfeited/Expired	(193,251)		20.31
Outstanding at December 31, 2018	2,593,310	$	21.41	5.6	$	22.4
Exercisable at December 31, 2018	1,789,819	$	19.77	5.1	$	17.9
Exercisable and expected to vest at December 31, 2018 (a)	2,533,128	$	21.33	5.6	$	22.1

(a) In addition to the options that are vested at December 31, 2018, the Company expects a portion of the unvested options to vest in the future. Options expected to vest in the future are determined by applying an estimated forfeiture rate to the options that are unvested as of December 31, 2018.

(b) The aggregate intrinsic value is based on the positive difference between the fair value of the Company’s common stock price of $29.77 on December 31, 2018, or the date of exercises, as appropriate, and the exercise price of the underlying stock options.

Restricted stock awards

Stock-Based Compensation

Schedule of restricted stock award and restricted stock unit activity

The following table summarizes information about restricted stock award activity during the year ended December 31, 2018:

		Weighted
		Average Grant
	Shares Subject	Date Fair
	to Restriction	Value
Outstanding at December 31, 2017	85,529	$	20.39
Vested	(54,343)		20.12
Forfeited	(6,553)		24.80
Outstanding at December 31, 2018	24,633	$	19.82

Restricted stock units

Stock-Based Compensation

Schedule of restricted stock award and restricted stock unit activity

The following table summarizes information about restricted stock unit activity for year ended December 31, 2018:

		Weighted
		Average Grant
	Shares Subject	Date Fair
	to Restriction	Value
Outstanding at December 31, 2017	652,123	$	25.47
Granted	428,464		33.76
Vested	(203,144)		24.95
Forfeited	(71,194)		26.89
Outstanding at December 31, 2018	806,249	$	29.88