Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Fair Value Assumptions for Stock Options

The following are the weighted-average assumptions used to calculate the grant-date fair values of stock option awards granted in the years ended December 31, 2016, 2015 and 2014:

	For the Years Ended December 31
	2016	2015	2014
Expected dividend yield	1.45%	1.53%	1.77%
Expected volatility	35.62%	40.32%	42.04%
Expected term	7.3 years	7.3 years	7.3 years
Risk-free interest rate	1.52%	1.96%	2.18%

Summary of Stock Option Activity

A summary of stock option activity for the year ended December 31, 2016 is presented below:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate IntrinsicValue ($000)
Options
Outstanding at January 1, 2016		507,084		$	36.57
Granted		103,709			44.03
Exercised		(167,675	)		23.95
Forfeited		(6,992	)		45.36
Outstanding at December 31, 2016		436,126			42.99		5.80	$	16,785
Vested or expected to vest at December 31, 2016		432,181			42.68		5.86		13,022
Exercisable at December 31, 2016		258,093			43.12		3.82		9,900

Summary of Stock Award Activity

A summary of stock award activity for the year ended December 31, 2016, is presented below:

	Shares			Weighted-Average Grant Date Fair Value
Stock Awards
Unvested at January 1, 2016		208,503		$	46.55
Granted		142,242			41.81
Vested		(32,319	)		59.41
Forfeited		(61,660	)		53.05
Unvested at December 31, 2016		256,766			40.74

Summary of SARs Activity

The following is a summary of SARs activity for the year ended December 31, 2016:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value ($000)
SARs
Outstanding at January 1, 2016		389,955		$	50.30
Granted		215,288			43.95
Exercised		(27,596	)		54.17
Forfeited		(24,065	)		34.58
Outstanding at December 31, 2016		553,582			47.81		7.94	$	18,642