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Net Earnings Per Share Net Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the reconciliation of the numerator and denominator utilized in the computation of basic and diluted earnings per share (in thousands): 
 
Three Months Ended March 31,
 
2019
 
2018
Numerator for earnings per share:
 
 
 
Net earnings for basic and diluted earnings per share
$
61,748

 
$
39,195

Denominator for earnings per share:
 
 
 
Weighted average number of common shares outstanding
135,541

 
138,504

Assumed exercise of stock options and vesting of restricted stock awards, net of shares assumed reacquired under the treasury stock method
1,624

 
2,490

Diluted shares outstanding
137,165

 
140,994