Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2011

Stock Incentive Plans (Tables) [Abstract]

Fair value of each option grant estimated on weighted-average assumptions:

The fair value of each option grant is estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

	Year Ended
	December 31, 2011	December 31, 2010	December 31, 2009
Dividend yield	5.74%	6.28%	7.35%
Expected volatility	34.80%	34.08%	29.40%
Risk-free interest rate	2.87%	3.23%	2.33%
Expected life (in years)	7.0	7.0	7.0
Weighted-average fair value	$9.60	$7.82	$4.38

Summary of stock options activity

The following table summarizes information about stock option activity for the twelve months ended December 31, 2011:

	Year Ended
	December 31, 2011			December 31, 2010			December 31, 2009
	Number of	Weighted		Number of	Weighted		Number of	Weighted
	Shares	Average		Shares	Average		Shares	Average
Stock Options	(000's)	Exercise Price		(000's)	Exercise Price		(000's)	Exercise Price
Options at beginning of year	1,207	$	39.45	1,062	$	37.71	817	$	38.29
Options granted	289		49.17	280		43.29	366		37.00
Options exercised	(232)		36.92	(129)		33.58	(96)		38.22
Options terminated	(12)		43.09	(6)		37.82	(25)		44.50
Options at end of period	1,252	$	42.12	1,207	$	39.45	1,062	$	37.71
Options exercisable at end of period	427	$	39.45	440	$	37.76	388	$	35.85
Weighted average fair value of
options granted during the period		$	9.60		$	7.82		$	4.38

Non-vested stock incentive awards

The following table summarizes information about stock optionsoutstanding at December 31, 2011:

		Options Outstanding					Options Exercisable
		Number	Weighted		Weighted Average		Number	Weighted		Weighted Average
		Outstanding	Average		Remaining		Exercisable	Average		Remaining
Range of Per Share Exercise Prices		(thousands)	Exercise Price		Contract Life		(thousands)	Exercise Price		Contract Life
$20-$30		20	$	25.82	1.0		20	$	25.82	1.0
$30-$40		390		36.75	5.9		179		36.46	4.5
$40+		842		44.99	7.5		228		42.96	6.1
Totals		1,252	$	42.12	6.9		427	$	39.45	5.2
Aggregate intrinsic value	$	15,528,000				$	6,439,000

Summary of stock options outstanding

The following table summarizes information about non-vested stock incentive awards as of December 31, 2011 and changes for the twelve months ended December 31, 2011:

	Stock Options			Restricted Stock
	Number of		Weighted Average	Number of	Weighted Average
	Shares		Grant Date	Shares	Grant Date
	(000's)		Fair Value	(000's)	Fair Value
Non-vested at December 31, 2010	768	$	6.19	420	$	41.09
Vested	(219)		6.12	(148)		41.90
Granted	289		9.60	245		49.20
Terminated	(13)		6.40	(9)		32.86
Non-vested at December 31, 2011	825	$	7.40	508	$	44.91