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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table Text Block]

			2012			2011			2010
Earnings:
	Net income (numerator for basic and diluted calculations)		$	631,893		$	546,045		$	535,742
Shares:
	Weighted average outstanding shares (denominator for basic calculations)
					73,737			73,586			73,157
Equivalent shares from outstanding stock options and warrants				416			522			1,537
		Diluted shares (denominator for diluted calculations)		74,153			74,108			74,694
Earnings per share:
	Basic		$	8.57		$	7.42		$	7.32
	Diluted		$	8.52		$	7.37		$	7.17

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- Definition

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