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Earnings Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
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 March 31,
 
 
2015
 
2014
Earnings:
 
 
 
 
Net income (numerator for basic and diluted calculations)
 
$
125,114

 
$
136,664

Shares:
 
 
 
 
Weighted average outstanding shares (denominator for basic calculation)
 
68,141

 
70,574

Equivalent shares from outstanding stock options
 
801

 
690

Denominator for diluted calculation
 
68,942

 
71,264

Earnings per share:
 
 
 
 
Basic
 
$
1.84

 
$
1.94

Diluted
 
$
1.81

 
$
1.92


The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended March 31, 2015, approximately 0.3 million stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. For the three months ended March 31, 2014, approximately 0.3 million stock options and approximately 0.9 million performance contingent shares were excluded from the calculation. Year-to-date amounts for equivalent shares from outstanding stock options and performance contingent shares are the weighted average of the individual quarterly amounts.