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Earnings per Share ("EPS") (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic EPS      
Net Income (Numerator) $ 126,351 $ 93,473 $ 113,869
Shares (Denominator) 67,195,180 67,236,681 67,506,554
Per Share Amount $ 1.88 $ 1.39 $ 1.69
Diluted EPS      
Net Income (Numerator) $ 126,351 $ 93,473 $ 113,869
Potential dilutive common shares 119,679 77,282 62,914
Shares (Denominator) 67,314,859 67,313,963 67,569,468
Per Share Amount (in dollars per share) $ 1.88 $ 1.39 $ 1.69