Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Share-based Compensation [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2011			2010			2009
Fair value of options granted	$	7.84		$	6.11		$	5.89
Risk free interest rate		1.4	%		1.7	%		2.0	%
Expected volatility		34.1	%		33.9	%		34.9	%
Expected dividend yield		2.0	%		2.1	%		2.0	%
Expected option life		5.8 years			3.6 years			3.5 years

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

			Weighted-		Weighted-
			average		average		Aggregate
	Number		exercise		contractual		intrinsic
	of shares		price		life		value
Outstanding, beginning of year		5,499	$	28.24
Granted		396		29.19
Exercised		(1,458)		27.28
Forfeited and expired		(630)		30.68
Outstanding, end of year		3,807		28.29		2.5 years	$	4,841
Vested or expected to vest, end of year		3,559		28.37		2.4 years		4,424
Exercisable, end of year		2,397		29.00		1.4 years		2,600

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

			Weighted-		Weighted-
			average		average		Aggregate
	Number		grant date		contractual		intrinsic
	of shares		fair value		life		value
Restricted Stock Awards
Outstanding, beginning of year		1,289	$	26.15
Awarded		395		30.17
Vested		(35)		23.39
Forfeited		(86)		27.65
Outstanding, end of year		1,563		27.14		2.9 years	$	42,975
Expected to vest, end of year		1,233		27.09		2.9 years		33,912
Restricted Stock Units
Outstanding, beginning of year		157	$	24.66
Awarded		56		30.25
Outstanding, end of year		213		26.38		2.0 years	$	5,871
Expected to vest, end of year		173		26.34		2.0 years		4,762