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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes information about the Company’s stock option awards during 2015:



	Number of Shares		Weighted-Average Exercise Price
Outstanding, January 1, 2015	1,013,224		$	22.72
Granted	131,852		36.49
Exercised	(491,638	)	22.42
Forfeited	(9,366	)	32.89
Outstanding, December 31, 2015	644,072		25.63

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes information about stock options outstanding at December 31, 2015:



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number of Shares	Average Remaining Life (Years)	Average Exercise Price		Number of Shares	Average Exercise Price
$11.45 to $20.69	241,854	4.17	$	16.41	241,854	$	16.41
$22.34 to $26.59	191,116	4.72	25.00		143,153	25.14
$33.45 to $36.31	121,800	8.99	36.26		2,000	33.45
$37.13 to $38.96	89,302	8.28	37.43		26,726	37.26

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each stock option grant on the date of grant was estimated using the Black-Scholes option-pricing model based on the following weighted average assumptions:



	2015		2014		2013
Risk-free interest rate	1.58	%	1.68	%	0.96	%
Expected life (years)	5.3		5.3		5.3
Expected volatility	31.1	%	42.6	%	48.9	%
Expected dividend yield	2.06	%	2.24	%	2.38	%

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable

The following table summarizes information about stock options outstanding that are expected to vest and stock options outstanding that are exercisable at December 31, 2015:



Options Outstanding, Expected to Vest						Options Outstanding, Exercisable
Shares	Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Term (Years)	Shares	Weighted- Average Exercise Price		Aggregate Intrinsic Value		Weighted- Average Remaining Term (Years)
626,523	$	25.63	$	6,400	5.81	413,733	$	20.86	$	6,063	4.61

Schedule of Share-based Compensation, Restricted Stock Units, Activity

The following table summarizes information about the Company’s Rights during 2015:



	Service Based Rights				Service and Performance Based Rights				Service and Market Based Rights
	Number of Units		Weighted-Average Grant Date Fair Value		Number of Units		Weighted-Average Grant Date Fair Value		Number of Units		Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2015	429,206		$	26.76	227,064		$	28.11	113,531		$	41.82
Granted	186,996		36.39		61,973		36.48		30,986		54.54
Forfeited	(13,526	)	30.86		(6,342	)	39.64		(3,171	)	49.48
Additional Earned	—		—		36,965		25.37		(2,057	)	32.06
Issued	(200,970	)	27.96		(105,234	)	25.37		(32,076	)	32.06
Outstanding, December 31, 2015	401,706				214,426				107,213