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Net Profit per Share (Tables)
12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income
$
400,235

 
$
231,418

 
$
189,682

Denominator:
 
 
 
 
 
Weighted average common shares outstanding, basic
80,064

 
80,085

 
79,856

Dilutive effect of potential common stock
1,293

 
1,747

 
1,628

Total shares, diluted
81,357

 
81,832

 
81,484

Net income per share, basic
$
5.00

 
$
2.89

 
$
2.38

Net income per share, diluted
$
4.92

 
$
2.83

 
$
2.33