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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2013
Equity [Abstract]  
Stock option plan activity
The following is a summary of the Company’s stock option plan activity and related information:

 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average
Remaining
Contractual Term in
Years
 
Aggregate
Intrinsic Value
(In thousands)
Balance as of December 31, 2012
1,626,606

 
$
14.90

 
7.8
 
$
11,358

Granted
439,929

 
23.61

 
 
 
 
Exercised
(158,889
)
 
14.76

 
 
 
 
Forfeited
(73,978
)
 
16.72

 
 
 
 
Cancelled
(27,780
)
 
28.32

 
 
 
 
Balance as of September 30, 2013
1,805,888

 
16.74

 
7.71
 
48,322

Exercisable as of September 30, 2013
943,027

 
15.66

 
6.82
 
26,419

Options vested and expected to vest as of September 30, 2013
1,805,888

 
16.74

 
7.71
 
48,322
Restricted stock activity
Restricted stock activity for the nine months ended September 30, 2013 is as follows:

 
Shares
 
Weighted-
Average Grant
Date Fair Value
Nonvested at December 31, 2012
141,561

 
$
12.52

Granted
84,547

 
27.71

Vested
(77,070
)
 
15.77

Cancelled
(33,375
)
 
12.53

Nonvested at September 30, 2013
115,663

 
$
21.45