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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Components of Basic and Diluted EPS
The components of basic and diluted earnings per share, or EPS, are as follows (in thousands, except share and per share amounts):
    
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Net income
$
9,865

 
$
1,873

 
$
13,828

 
$
4,611

Less: income allocated to participating securities
$
(5
)
 
$
(2
)
 
$
(8
)
 
$
(7
)
Net income attributable to common stockholders (A)
$
9,860

 
$
1,871

 
$
13,820

 
$
4,604

Weighted average common shares outstanding — basic (B)
46,442,327

 
45,602,061

 
46,334,499

 
45,564,059

Dilutive effect of stock options, RSUs and RSAs
2,558,226

 
1,921,126

 
2,572,313

 
1,841,452

Weighted average common shares outstanding — diluted (C)
49,000,553

 
47,523,187

 
48,906,812

 
47,405,511

Net income per share:
 
 
 
 
 
 
 
Basic (A/B)
$
0.21

 
$
0.04

 
$
0.30

 
$
0.10

Diluted (A/C)
$
0.20

 
$
0.04

 
$
0.28

 
$
0.10
Schedule of Securities Excluded from Calculation of Diluted Weighted Average Common Shares Outstanding Due to Anti-dilutive Effect
The following securities have been excluded from the calculation of diluted weighted average common shares outstanding because the effect is anti-dilutive:
    
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Stock options
313,650

 
119,750

 
313,650

 
617,072

RSAs
1,082

 
—

 
1,082

 
—

RSUs
—

 
—

 
148,100

 
—

Common stock subject to repurchase
21,317

 
53,869

 
21,317

 
53,869