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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract]  
Earnings Per Share Reconciliation

Basic and diluted EPS calculations are detailed as follows (in thousands, except per share data):

    Year Ended December 31, 2013
    Net Income Weighted-Average Shares Per Share
    (Numerator) (Denominator) Amount
Net income per basic common share $450,003  85,426 $5.27
Effect of dilutive stock option, restricted         
 stock and restricted stock unit securities     1,120   
Net income per diluted common share $450,003  86,546 $5.20

    Year Ended December 31, 2012
    Net Income Weighted-Average Shares Per Share
    (Numerator) (Denominator) Amount
Net income per basic common share $461,443  87,841 $5.25
Effect of dilutive stock option, restricted         
 stock and restricted stock unit securities     1,138   
Net income per diluted common share $461,443  88,979 $5.19

    Year Ended December 31, 2011
    Net Income Weighted-Average Shares Per Share
    (Numerator) (Denominator) Amount
Net income per basic common share $432,968  90,833 $4.77
Effect of dilutive stock option, restricted         
 stock and restricted stock unit securities     1,492   
Net income per diluted common share $432,968  92,325 $4.69