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Net Profit per Share (Tables)
12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Basic And Diluted
The following table sets forth the computation of basic and diluted net income per share attributable to common stock (in thousands, except per share amounts): 
 
Year Ended December 31,
 
2016
 
2015
 
2014
Numerator:
 
 
 
 
 
Net income
$
189,682

 
$
144,020

 
$
145,832

Denominator:
 
 
 
 
 
Weighted-average common shares outstanding, basic
79,856

 
79,998

 
80,754

Dilutive effect of potential common stock
1,628

 
1,523

 
1,529

Total shares, diluted
81,484

 
81,521

 
82,283

Net income per share, basic
$
2.38

 
$
1.80

 
$
1.81

Net income per share, diluted
$
2.33

 
$
1.77

 
$
1.77