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Net income per share attributable to common stockholders (Tables)
12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Net Income per Share, Basic and Diluted
The following table presents the calculations of basic and diluted net income per share attributable to common stockholders:
 
Year ended December 31,
(in thousands, except per share data)
2015
 
2014
 
2013
 
Class A
 
Class B
 
Class A
 
Class B
 
 
Numerator:
 
 
 
 
 
 
 
 
 
Allocation of net income
$
24,559

 
$
11,572

 
$
16,647

 
$
111,441

 
$
60,578

Less: net income allocable to participating securities

 

 
(2,147
)
 
(14,365
)
 
(16,727
)
Net income attributable to common stockholders—basic
24,559

 
11,572

 
14,500

 
97,076

 
43,851

Add: net income allocable to dilutive participating securities

 

 
2,277

 
1,981

 
2,309

Reallocation of net income as a result of conversion of Class B to Class A shares
11,572

 

 
97,076

 

 

Reallocation of net income to Class B shares

 
1,974

 

 
2,237

 

Net income attributable to common stockholders—diluted
$
36,131

 
$
13,546

 
$
113,853

 
$
101,294

 
$
46,160

 
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
 
Weighted-average common shares—basic
91,486

 
43,109

 
13,575

 
90,878

 
81,018

Conversion of Class B to Class A common stock outstanding
43,109

 

 
90,878

 

 

Effect of potentially dilutive shares
11,891

 
11,810

 
19,177

 
19,115

 
17,923

Weighted-average common shares—diluted
146,486

 
54,919

 
123,630

 
109,993

 
98,941

 
 
 
 
 
 
 
 
 
 
Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
 
 
Basic
$
0.27

 
$
0.27

 
$
1.07

 
$
1.07

 
$
0.54

Diluted
$
0.25

 
$
0.25

 
$
0.92

 
$
0.92

 
0.47

Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share
The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Year ended December 31,
(in thousands)
2015
 
2014
 
2013
Redeemable convertible preferred stock

 
15,136

 
30,523
Stock options, ESPP shares, and RSUs
2,680

 
360

 
1,409
Unvested restricted stock awards
1

 
425

 
380
 
2,681

 
15,921

 
32,312