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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2014
1,800,697

 
$
28.78

 
7.3
 
$
51,558

Granted
262,747

 
$
58.84

 
 
 
 
Exercised
(212,349
)
 
$
25.58

 
 
 
 
Forfeited
(78,685
)
 
$
45.75

 
 
 
 
Balance as of June 30, 2015
1,772,410

 
$
32.86

 
7.0
 
$
120,588

Exercisable as of June 30, 2015
1,139,894

 
$
23.62

 
6.1
 
$
88,090

Options vested and expected to vest as of June 30, 2015
1,772,410

 
$
32.86

 
7.0
 
$
120,588
Restricted stock activity
Restricted stock activity for the six months ended June 30, 2015 was as follows:

 
Shares
 
Weighted-
Average Grant
Date Fair Value
Nonvested at December 31, 2014
82,673

 
$
45.76

Granted
100,954

 
$
58.62

Vested
(48,066
)
 
$
44.78

Cancelled
(15,512
)
 
$
54.91

Nonvested at June 30, 2015
120,049

 
$
55.79