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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [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):
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Earnings:
 
 
 
 
 
 
 
 
Net income (numerator for basic and diluted calculations)
 
$
202,698

 
$
204,374

 
$
372,205

 
$
304,604

Shares:
 
 
 
 
 
 
 
 
Weighted average outstanding shares (denominator for basic calculation)
 
62,678

 
64,071

 
62,719

 
64,278

Equivalent shares from outstanding stock options
 
1,020

 
1,179

 
1,100

 
1,277

Denominator for diluted calculation
 
63,698

 
65,250

 
63,819

 
65,555

Earnings per share:
 
 
 
 
 
 
 
 
Basic
 
$
3.23

 
$
3.19

 
$
5.93

 
$
4.74

Diluted
 
$
3.18

 
$
3.13

 
$
5.83

 
$
4.65


Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block] The following table presents approximate amounts of stock options and performance contingent shares excluded from the calculation of common equivalent shares (in thousands):
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Excluded from common equivalent shares:
 
 
 
 
 
 
 
 
Stock options
 
250

 
225

 
420

 
295

Performance contingent shares
 
242

 
229

 
171

 
217