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Net Income Per Share (Tables)
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Reconciliation of Weighted Average Common Shares Outstanding
A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows:
 
Three months ended June 30
 
Six months ended June 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Weighted average shares outstanding (basic)
173,394

 
176,433

 
173,363

 
177,446

Impact of common stock equivalents
924

 
1,098

 
1,004

 
1,042

Weighted average shares outstanding (diluted)
174,318

 
177,531

 
174,367

 
178,488