Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Key Assumptions Used to Estimate Fair Value of Stock Options Granted

The following are the key assumptions used for three-month period ended March 31, 2017:

Risk-free interest rate	1.9%
Expected life of the options (years)	5
Expected stock price volatility	35.4%
Expected dividend rate	2.8%

Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2018:

	Number of Shares			Weighted Average Exercise Price
	(In thousands)
Options outstanding, beginning of period		3,169		$	32.49
Additional options granted based upon achievement of    specified performance criteria		81			32.42
Canceled/Expired		(168	)		27.24
Exercised		(55	)		27.17
Options outstanding, end of period		3,027			32.74

Fully Vested Stock Options and Stock Options Expected to Vest

A summary of stock options outstanding as of March 31, 2018 is as follows:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms		Aggregate Intrinsic Value
	(In thousands)				(In years)		(In thousands)
Outstanding		3,027	$	32.74		5.84	$	33,168
Exercisable		2,639		33.06		5.44		28,147

Restricted Stock Award Activity

A summary of restricted stock award activity is as follows:

	Shares			Weighted Average Grant Date Fair Value
	(In thousands)
Restricted stock awards at beginning of period		234		$	31.42
Awarded		201			37.85
Released		(69	)		32.00
Forfeited		(6	)		35.72
Restricted stock awards at end of period		360			34.84