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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Oct. 20, 2014
Sep. 30, 2014
Oct. 01, 2013
Sep. 30, 2014
Oct. 01, 2013
Dec. 31, 2013
Sep. 30, 2014
Treasury Stock
Jul. 31, 2013
Treasury Stock
Stockholders' Equity                
Cash dividends declared per common share (in dollars per share) $ 0.165 $ 0.165 $ 0.14 $ 0.445 $ 0.38      
Stockholders Equity:                
Additional number of shares authorized to repurchase               7,500,000
Number of shares authorized to be repurchased               48,500,000
Repurchased shares since program inception   41,916,080   41,916,080   38,865,951 41,900,000  
Value of shares repurchased since program inception   $ 1,158,496   $ 1,158,496   $ 1,015,473 $ 1,158,500  
Shares repurchased during period             500,000  
Treasury stock repurchased during period       $ 140,327     $ 19,800