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Earnings Per Share (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings:
Net income (numerator for basic and diluted calculations)	$ 185,535,000	$ 123,318,000
Shares:
Weighted average outstanding shares (denominator for basic calculation)	73,838,000	73,575,000
Equivalent shares from outstanding stock options	551,000	468,000
Denominator for diluted calculation	74,389,000	74,043,000
Earnings Per Share:
Basic earning per share	$ 2.51	$ 1.68
Diluted earnings per share	$ 2.49	$ 1.67

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