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Earnings Per Share ("EPS") (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Basic EPS      
Net Income (Numerator) $ 113,869 $ 116,897 $ 129,758
Shares (Denominator) 67,506,554 67,921,353 68,373,732
Per Share Amount $ 1.69 $ 1.72 $ 1.90
Diluted EPS      
Net Income (Numerator) $ 113,869 $ 116,897 $ 129,758
Potential dilutive common shares 62,914 83,088 20,892
Shares (Denominator) 67,569,468 68,004,441 68,394,624
Per Share Amount $ 1.69 $ 1.72 $ 1.90