Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Value Assumptions for Stock Options

The risk-free rate is the U.S. Treasury note rate that corresponds to the expected option term at the date of grant.

	For the Years Ended December 31
	2014	2013	2012
Expected dividend yield	1.77%	2.01%	2.10%
Expected volatility	42.04%	42.48%	43.19%
Expected term	7.3 years	7.4 years	7.4 years
Risk-free interest rate	2.18%	1.53%	1.41%

Summary of Stock Option Activity

A summary of stock option activity for the year ended December 31, 2014 is presented below:

	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value ($000)
Options
Outstanding at January 1, 2014		505,112	$	30.80
Granted		53,175		61.69
Exercised		(67,029)		26.17
Forfeited		(10,522)		54.41
Outstanding at December 31, 2014		480,736		34.35		4.43	$	2,757
Vested or expected to vest at December 31, 2014		480,736		34.35		4.43		2,757
Exercisable at December 31, 2014		384,457		27.37		3.37		4,885

Summary of Stock Award Activity

A summary of stock award activity for the year ended December 31, 2014, is presented below:

	Shares		Weighted-Average Grant Date Fair Value
Unvested Stock Awards
Unvested at January 1, 2014		221,090	$	48.75
Granted		89,234		59.52
Vested		—		—
Forfeited		127,314		43.12
Unvested at December 31, 2014		183,010		57.92

Summary of SARs Activity

A summary of SARs activity for the year ended December 31, 2014 is presented below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value ($000)
SARs
Outstanding at January 1, 2014		148,311		$	54.60
Granted		116,843			61.62
Forfeited		(33,972	)		55.99
Outstanding at December 31, 2014		231,182			57.94		8.40	$	(4,130	)