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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Earnings per common share:    
Net earnings $ 22,268 $ 16,600
Net earnings available to common shareholders 22,268 16,600
Less: Net earnings allocated to restricted stock 72 66
Net earnings allocated to common shareholders 22,196 16,534
Weighted Average Shares Outstanding (denominator) 104,303 105,651
Earnings per common share $ 0.21 $ 0.16
Diluted earnings per common share:    
Net income allocated to common shareholders (numerator) $ 22,196 $ 16,534
Weighted Average Shares Outstanding 104,303 105,651
Incremental shares from assumed exercise of outstanding options 197 53
Diluted Weighted Average Shares Outstanding (denominator) 104,500 105,704
Diluted earnings per common share $ 0.21 $ 0.16