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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The weighted-average fair value of options granted and the weighted-average assumptions used in the Black-Scholes-Merton option pricing model for such grants were as follows:



	2017			2016			2015
Dividend Yield	0.4		%	0.4		%	0.3		%
Expected Volatility	32.8		%	34.2		%	28.9		%
Risk-free Interest Rate	1.9		%	1.3		%	1.6		%
Expected Term (in years)	5.3			5.3			5.2
Weighted-average Fair Value of Stock Options Granted	$	8.55		$	7.10		$	8.41

Summary Information about Stock Options Outstanding

The following table summarizes information about stock options outstanding at December 31, 2017:



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding December 31, 2017	Weighted Average Remaining Contractual Life (in Years)	Weighted Average Exercise Price		Number Exercisable December 31, 2017	Weighted Average Exercise Price
$10.01-15.00	61	0.79	$	14.11	61	$	14.11
15.01-20.00	49	2.15	19.92		49	19.92
20.01-25.00	586	8.14	22.67		191	22.73
25.01-30.00	780	8.37	27.50		244	28.09
30.01-32.20	176	7.06	32.10		120	32.06
10.01-32.20	1,652	7.69	25.56		665	25.39

Summary of Stock Option Activity

The table below summarizes option activity for the year ended December 31, 2017:



	Options (In Thousands)		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value (in Thousands)		Weighted Average Fair Value
Outstanding at January 1, 2017	1,407		$	24.21
Granted	518		27.18
Exercised	(184	)	18.83
Forfeited/expired	(89	)	27.52
Outstanding at December 31, 2017	1,652		25.56		7.69	$	23,607	$	8.12
Expected to Vest at December 31, 2017	894		25.65		8.56	12,694		7.95
Exercisable at December 31, 2017	665		25.39		6.36	9,616		8.35

Summary of Restricted Stock Activity

The following table summarizes information about restricted stock activity during 2017:



	Restricted Stock (In Thousands)			Weighted Average Fair Value
Non-vested at January 1, 2017	953			$	27.45
Granted	375			29.27
Vested	(325	)		28.09
Forfeited	(56	)		27.27
Non-vested at December 31, 2017	947		¹	27.96

Summary of Performance Share Units

The following table summarizes information about performance share unit activity during 2017:



	Performance Share Units (In Thousands)		Weighted Average Fair Value
Non-vested at January 1, 2017	693		$	25.67
Granted	479		27.00
Vested	(269	)	26.51
Forfeited/unearned	(81	)	25.74
Non-vested at December 31, 2017	822		26.31