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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):
 
 
 
2014
 
2013
 
2012
Earnings:
 
 
 
 
 
 
Net income (numerator for basic and diluted calculations)
 
$
684,047

 
$
418,837

 
$
631,893

Shares:
 
 
 
 
 
 
Weighted average outstanding shares (denominator for basic calculations)
 
69,248

 
71,917

 
73,737

Equivalent shares from outstanding stock options
 
714

 
544

 
416

Diluted shares (denominator for diluted calculations)
 
69,962

 
72,461

 
74,153

Earnings per share:
 
 
 
 
 
 
Basic
 
$
9.88

 
$
5.82

 
$
8.57

Diluted
 
9.78

 
5.78

 
8.52