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Net Income Per Share (Tables)
3 Months Ended
Mar. 31, 2018
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 March 31
 
 
2018
 
2017
 
 
(in thousands)
Weighted average shares outstanding (basic)
175,303

 
174,150

 
Impact of common stock equivalents
1,265

 
1,427

 
Weighted average shares outstanding (diluted)
176,568

 
175,577