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Significant Accounting Policies (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings per common share:        
Net earnings available to common shareholders $ 23,619 $ 21,038 $ 45,887 $ 37,638
Less: Net earnings allocated to restricted stock 82 82 149 148
Net earnings allocated to common shareholders (numerator) 23,537 20,956 45,738 37,490
Weighted Average Shares Outstanding (denominator) 104,378 105,659 104,341 105,655
Earnings per common share $ 0.23 $ 0.20 $ 0.44 $ 0.35
Diluted earnings per common share:        
Net income allocated to common shareholders (numerator) $ 23,537 $ 20,956 $ 45,738 $ 37,490
Weighted Average Shares Outstanding 104,378 105,659 104,341 105,655
Incremental shares from assumed exercise of outstanding options 240 105 221 79
Diluted Weighted Average Shares Outstanding (denominator) 104,618 105,764 104,562 105,734
Diluted earnings per common share $ 0.23 $ 0.20 $ 0.44 $ 0.35