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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

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

			Three months ended
		March 31,
			2013			2012
Earnings:
	Net income (numerator for basic and diluted calculations)	$	185,535		$	123,318
Shares:
	Weighted average outstanding shares (denominator for basic calculation)		73,838			73,575
	Equivalent shares from outstanding stock options		551			468
	Denominator for diluted calculation		74,389			74,043
Earnings per share:
	Basic	$	2.51		$	1.68
	Diluted	$	2.49		$	1.67

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