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Net income per share attributable to common stockholders (Tables)
 3 Months Ended
Mar. 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:
 
Three months ended
(dollars in thousands, except per share data)
March 31,
2015
 
March 31,
2014
 
Class A
 
Class B
 
Common
Numerator:
 
 
 
 
 
Allocation of net income
$
8,926

 
$
7,826

 
$
11,049

Less: net income allocable to participating securities
—

 
—

 
(3,040
)
Net income attributable to common stockholders—basic
$
8,926

 
$
7,826

 
$
8,009

Add: net income allocable to dilutive participating securities
—

 
—

 
443

Reallocation of net income as a result of conversion of Class B to Class A shares
7,826

 
—

 
—

Reallocation of net income to Class B shares
—

 
968

 
—

Net income attributable to common stockholders—diluted
$
16,752

 
$
8,794

 
$
8,452

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares—basic
70,483

 
61,795

 
81,582

Conversion of Class B to Class A common stock outstanding
61,795

 
—

 
—

Effect of potentially dilutive stock options, ESPP shares, and RSUs
16,295

 
16,202

 
19,201

Weighted-average common shares—diluted
148,573

 
77,997

 
100,783

 
 
 
 
 
 
Net income per share attributable to common stockholders:
 
 
 
 
 
Basic
$
0.13

 
$
0.13

 
$
0.10

Diluted
$
0.11

 
$
0.11

 
$
0.08
Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share
The following potentially dilutive shares of were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:
 
Three months ended
(in thousands)
March 31,
2015
 
March 31,
2014
Series A redeemable convertible preferred stock
—

 
30,523

Stock options, ESPP shares, and RSUs
1,984

 
3,634

Unvested stock awards and stock options
5

 
451

 
1,989

 
34,608