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STOCK PLANS (Tables)

12 Months Ended

Dec. 31, 2014

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

Summary of stock option activity

The following table summarizes stock option activity for the years ended December 31, 2014, 2013 and 2012, under all Plans:

		Year Ended December 31,
		2014							2013							2012
		Options			Weighted Average Exercise Price				Options			Weighted Average Exercise Price				Options			Weighted Average Exercise Price
Balance at beginning of year		2,452,648			$	36.52			3,060,944			$	30.98			3,632,463			$	26.05
Options granted		5,121			69.61				273,105			70.88				412,980			47.66
Options exercised		(329,986	)		27.63				(774,783	)		26.20				(962,029	)		19.52
Options canceled		(40,590	)		47.21				(106,618	)		40.54				(22,470	)		24.07
Balance at end of year		2,087,193			37.80				2,452,648			36.52				3,060,944			30.98
Exercisable at end of year		1,818,218			33.89				1,837,014			29.93				2,208,455			27.19

Weighted average assumptions used for estimating fair value of options granted

The weighted average assumptions for each of the three years ended December 31, 2014 were as follows:

		Year Ended December 31,
		2014				2013				2012
Expected volatility		32.21		%		32.97		%		45.67		%
Dividend yield		1.41		%		1.40		%		1.66		%
Risk-free interest rate		1.61		%		1.52		%		0.70		%
Expected option life (years)		4.4				4.4				4.5
Weighted average fair value per option granted during the year		$	17.52			$	18.14			$	15.87

Summary of nonvested stock options

The following table summarizes non-vested stock options for the year ended December 31, 2014:

		Year Ended December 31, 2014
		Number of Options			Weighted Average Fair Value at Grant Date
Balance at beginning of year		615,634			$	16.32
Granted		5,121			17.52
Vested		(326,596	)		15.63
Forfeited		(25,184	)		13.17
Balance at end of year		268,975			17.48

Summary of information about awards outstanding, by exercise price range

The following table summarizes information about awards outstanding as of December 31, 2014:

		Outstanding							Exercisable
Exercise Price Range		Number of Stock Options			Weighted Average Exercise Price				Number of Stock Options			Weighted Average Exercise Price				Weighted Average Remaining Life (years)
Under $29.99		572,351			$	24.14			572,351			$	24.14			4.2
$30.00 - $39.99		917,607			33.21				917,272			33.21				5.4
Over $40.00		597,235			57.94				328,595			52.75				8.1
		2,087,193							1,818,218							5.5

Summary of restricted share award activity

The following table summarizes restricted share award activity for the years ended December 31, 2014, 2013 and 2012, under all Plans:

		Year Ended December 31,
		2014							2013							2012
		Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value				Shares			Weighted Average Grant Date Fair Value
Balance at beginning of year		115,316			$	39.55			336,808			$	28.49			379,233			$	28.06
Shares granted		14,927			66.32				14,464			70.88				20,099			47.81
Shares vested		(80,753	)		31.88				(224,021	)		25.68				(62,524	)		32.10
Shares forfeited		—			—				(11,935	)		25.76				—			—
Balance at end of year		49,490			60.14				115,316			39.55				336,808			28.49

Summary of restricted stock unit activity

The following table summarizes restricted stock unit activity for the years ended December 31, 2014, 2013 and 2012, under all Plans:

		Year Ended December 31,
		2014							2013							2012
		Units			Weighted Average Grant Date Fair Value				Units			Weighted Average Grant Date Fair Value				Units			Weighted Average Grant Date Fair Value
Balance at beginning of year		283,944			$	47.38			288,669			$	40.83			166,519			$	34.55
Units granted		2,861			70.71				69,925			67.17				133,944			47.97
Units vested		(40,035	)		36.59				(33,698	)		39.20				(10,499	)		33.06
Units forfeited		(5,274	)		52.19				(40,952	)		41.70				(1,295	)		35.55
Balance at end of year		241,496			49.34				283,944			47.38				288,669			40.83

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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