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Stockholders' equity (Tables)
 3 Months Ended
Mar. 31, 2016
Stockholders' equity  
Summary of stock option activity

 

The following table summarizes stock option activity for the three months ended March 31, 2016 (shares and intrinsic value in thousands):

 

 

 

Number of shares

 

Weighted-average
exercise price

 

Weighted-average
remaining contractual
term

 

Aggregate intrinsic
value

 

Outstanding at December 31, 2015

 
2,043

 

$
11.49

 
7.6

 

$
6,740

 

Granted

 
30

 
13.64

 

—

 

—

 

Exercised

 
(13

)
10.60

 

—

 

—

 

Forfeited

 

—

 

—

 

—

 

—

 

Expired

 

—

 

—

 

—

 

—

 

 

 

 

 

 

 

 

 

 

 

Outstanding at March 31, 2016

 
2,060

 

$
11.53

 
7.4

 

$
4,036

 

 

 

 

 

 

 

 

 

 

 

 

 

Vested at March 31, 2016

 
1,073

 

$
11.38

 
7.2

 

$
2,288

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable at March 31, 2016

 
1,073

 

$
11.38

 
7.2

 

$
2,288

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of restricted share activity

 

The following table summarizes restricted share activity for the three months ended March 31, 2016 (shares in thousands):

 

 

 

Number of shares

 

Weighted-average
grant date fair value

 

Outstanding at December 31, 2015

 
494 

 

$
9.79 

 

Granted

 

—

 

—

 

Vested

 

—

 

—

 

Forfeited

 

—

 

—

 

 

 

 

 

 

 

Outstanding at March 31, 2016

 
494 

 

$
9.79 

 

 

 

 

 

 

 

 

 

Time Based Stock Option | Black Scholes Pricing Model  
Equity incentive plans  
Schedule of valuation assumptions

 

Black-Scholes Option Valuation Assumptions

 

Three Months Ended
March 31, 2016

 

2015

 

Risk-free interest rate

 
1.60 

%

1.76%-2.12%

 

Dividend yield

 

—

 

—

 

Volatility

 
26.37 

%

25.8%-29.5%

 

Weighted-average expected term (years)

 
6.0 

 
6.3