STOCK INCENTIVE AND STOCK OPTION PLANS (Tables)

12 Months Ended

Dec. 31, 2012

STOCK INCENTIVE AND STOCK OPTION PLANS

Activity in stock option plans

	Options			Weighted-average Exercise Price		Weighted- average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Balance at December 31, 2009		896,830		$	22.55
Granted		387,250			62.74
Exercised		(195,530	)		17.36
Forfeited		(8,555	)		41.54
Expired		(6,400	)		9.33
Balance at December 31, 2010		1,073,595			37.92
Granted		316,159			115.71
Exercised		(134,520	)		23.93
Forfeited		(12,197	)		57.68
Balance at December 31, 2011		1,243,037			59.02
Granted		321,945			119.34
Exercised		(241,815	)		31.73
Forfeited		(13,999	)		67.86
Balance at December 31, 2012		1,309,168		$	78.80	7.30	$	44,192,177
Exercisable, December 31, 2010		222,110		$	26.36	5.40	$	18,683,972
Exercisable, December 31, 2011		721,210		$	38.75	6.25	$	37,526,500
Exercisable, December 31, 2012		785,869		$	51.40	6.26	$	44,176,663

Weighted-average grant date fair value of performance and restricted shares

	Performance Shares					Restricted Shares
	Shares			Weighted-average Fair Value		Shares			Weighted-average Fair Value
Nonvested at December 31, 2009		1,213,386		$	40.63		69,866		$	27.68
Granted		186,947			60.92		68,290			52.16
Vested		(704,931	)		38.62		(68,266	)		27.33
Cancelled		(200,324	)		56.53		—			—
Forefeited		(13,307	)		30.98		—			—
Nonvested at December 31, 2010		481,771			45.10		69,890			51.94
Granted		229,436			86.65		13,555			108.51
Vested		(178,653	)		48.03		(1,600	)		42.61
Forfeited		(7,163	)		59.15		—			—
Nonvested at December 31, 2011		525,391			62.05		81,845			61.49
Granted		325,590			89.92		3,150			91.68
Vested		(194,484	)		25.46		(22,766	)		52.16
Forfeited		(26,413	)		91.94		—			—
Nonvested at December 31, 2012		630,084		$	86.49		62,229		$	66.43

Fair value of option grant estimated on the grant date using Black-Scholes option pricing model assumptions

	Years ended December 31,
	2012			2011			2010
Expected life (years)		5			5			5
Risk-free interest rate		1.05	%		1.87	%		2.26	%
Expected volatility		58.98	%		55.39	%		54.23	%
Dividend yield		1.3	%		1.3	%		1.4	%