Share-Based Arrangements (Tables)

12 Months Ended

Dec. 31, 2018

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

Schedule of share-based compensation, stock options, activity

Stock option activity is as follows:

	Options		Weighted average- exercise price
Options outstanding at December 31, 2017	925,385		$	40.43
Granted	199,510		62.46
Exercised	(162,663	)	34.54
Forfeited or expired	(26,980	)	48.93
Options outstanding at December 31, 2018	935,252		$	45.91

Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding

The following table presents information regarding options outstanding as of December 31, 2018:

Weighted-average remaining contractual term - options outstanding (years)	6.4
Aggregate intrinsic value - options outstanding (in thousands)	$	10,123
Weighted-average exercise price - options outstanding	$	45.91
Options exercisable	374,911
Weighted-average remaining contractual term - options exercisable (years)	4.5
Aggregate intrinsic value - options exercisable (in thousands)	$	6,738
Weighted-average exercise price - options exercisable	$	37.27

Schedule of share-based payment award, stock options, valuation assumptions

The fair value of each option award is estimated on the date of grant using the Black-Scholes option valuation model. The following table indicates the weighted-average assumptions used in estimating fair value:

	2018			2017			2016
Expected option term (years)	4.9			5.0			5.2
Expected volatility	18.1		%	19.9		%	26.0		%
Risk-free interest rate	2.6		%	1.9		%	1.2		%
Expected dividend yield	1.5		%	1.6		%	1.8		%
Per share fair value of options granted	$	10.65		$	8.61		$	8.63

Schedule of share-based compensation, restricted stock and restricted stock units activity

Restricted Stock Award and Restricted Stock Unit activity is as follows:

	Restricted Stock Awards		Weighted- average grant date fair value
Restricted Stock outstanding at December 31, 2017	154,882		$	44.50
Granted	61,747		62.63
Vested	(64,389	)	48.80
Forfeited or expired	(8,543	)	50.95
Restricted Stock outstanding at December 31, 2018	143,697		$	49.97