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Equity Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the activity of stock option awards
The Company uses a Black-Scholes option valuation model to estimate the fair value of each option awarded. A summary of the activity of stock option awards issued and outstanding under Company plans is as follows for the six months ended June 30, 2013:
 
 
Shares
 
Wtd. Avg.
Exercise
Price
 
Wtd. Avg.
Remaining
Contractual Term (years)
 
Aggregate
Intrinsic
Value
 
(in thousands)
 
 
 
 
 
(in thousands)
Options outstanding at December 31, 2012
1,198

 
$
18.92

 
6.85
 
$
11,090

Options granted
—

 
—

 
 
 
 
Options exercised
(234
)
 
$
17.43

 
 
 
 
Options forfeited/canceled/expired
(5
)
 
$
21.34

 
 
 
 
Options outstanding at June 30, 2013
959

 
$
19.28

 
6.75
 
$
14,074

Options vested and expected to vest at June 30, 2013
929

 
$
19.21

 
6.71
 
$
13,701

Options exercisable at June 30, 2013
594

 
$
18.23

 
6.13
 
$
9,346
Summary of the activity of restricted stock
A summary of the activity of restricted stock outstanding is as follows for the six months ended June 30, 2013:
 
Shares
 
Wtd. Avg.
Grant  Date
Fair Value
 
(in thousands)
 
 
Restricted stock outstanding at December 31, 2012
670

 
$
18.14

Granted
345

 
37.40

Vested
(131
)
 
21.29

Forfeited/canceled
—

 
—

Restricted stock outstanding at June 30, 2013
884

 
$
23.00