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Earnings per Share ("EPS") (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic EPS      
Net Income (Numerator) $ 93,473 $ 113,869 $ 116,897
Shares (Denominator) 67,236,681 67,506,554 67,921,353
Per Share Amount $ 1.39 $ 1.69 $ 1.72
Diluted EPS      
Net Income (Numerator) $ 93,473 $ 113,869 $ 116,897
Potential dilutive common shares 77,282 62,914 83,088
Shares (Denominator) 67,313,963 67,569,468 68,004,441
Per Share Amount (in dollars per share) $ 1.39 $ 1.69 $ 1.72