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Net Income Per Share (Tables)
9 Months Ended
Sep. 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 September 30
 
Nine months ended September 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Weighted average shares outstanding (basic)
173,020

 
174,338

 
173,248

 
176,399

Impact of common stock equivalents
1,044

 
1,004

 
1,017

 
1,029

Weighted average shares outstanding (diluted)
174,064

 
175,342

 
174,265

 
177,428