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Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Weighted average shares outstanding (basic)
174,991

 
173,020

 
174,582

 
173,248

Impact of common stock equivalents
1,225

 
1,044

 
1,194

 
1,017

Weighted average shares outstanding (diluted)
176,216

 
174,064

 
175,776

 
174,265