Shareholders' Equity Transactions (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

The following table summarizes information about stock option activity for the three years ended 2012, 2011 and 2010:

	2012			Weighted Average Exercise Price		2011			Weighted Average Exercise Price		2010			Weighted Average Exercise Price
Options outstanding at January 1	4,455,365			$	28.99	4,484,195			$	29.60	4,619,528			$	29.28
Granted	761,892			13.44		608,896			24.57		646,797			25.22
Exercised	(9,417		)	10.70		(178,744		)	23.15		(399,144		)	23.08
Canceled	(543,206		)	31.52		(458,982		)	31.42		(382,986		)	25.07
Options outstanding at December 31	4,664,634			$	26.21	4,455,365			$	28.99	4,484,195			$	29.60
Options exercise price range at December 31	13.37 to					10.70 to					10.70 to
	$	47.80				$	47.80				$	47.80
Options exercisable at December 31	3,074,275					2,960,317					2,941,772
Options available for grant at December 31*	1,248,033					1,914,574					2,478,905

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

The following table summarizes information about stock options outstanding at December 31, 2012:

	Options Outstanding				Options Exercisable
Exercise Prices	Number Outstanding At 12/31/12	Weighted Average Remaining Contractual Life Years	Weighted Average Exercise Price		Number Exercisable At 12/31/12	Weighted Average Exercise Price
$ 13.37 – $15.00	742,186	9.6	$	13.39	1,986	$	13.37
$ 15.01 – $25.00	1,774,431	6.8	22.50		1,198,832	22.15
$ 25.01 – $35.00	1,064,676	6.8	25.85		790,117	25.98
$ 35.01 – $47.80	1,083,341	1.7	41.45		1,083,340	41.45
Total	4,664,634	5.8	$	26.21	3,074,275	$	29.93

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

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

	2012		2011		2010
Expected dividend yield	0.4	%	0.2	%	0.21	%
Expected stock price volatility	41.0	%	37.3	%	39.6	%
Risk-free interest rate	0.94	%	1.11	%	1.57	%
Expected life in years	6.0		5.9		3.9
Forfeiture percentage	7.6	%	6.9	%	10.5	%