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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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