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Equity Compensation Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Shares Authorized under Stock Option and Warrant Plans, by Exercise Price Range
options outstanding as of December 31, 2012, are as follows (in thousands, except exercise price and life):

Range of
 
 
 
Weighted-Average
 
Currently
Exercise Prices
 
Options
 
Remaining Life
 
Exercisable
$
10.00

-
$
15.00

 
 
400

 
 
3.1
 
 
380

 
$
15.01

-
$
20.00

 
 
1,120

 
 
2.5
 
 
1,120

 
$
20.01

-
$
25.00

 
 
25

 
 
4.3
 
 
12

 
$
35.01

-
$
40.00

 
 
90

 
 
8.4
 
 
—

 
 
 
 
 
 
1,635

 
 
3.0
 
 
1,512

 
Schedule of Stock Options Activity
A summary of stock option activity for the years ended December 31, 2012, 2011 and 2010, is as follows (in thousands, except exercise price):
 
2012
 
2011
 
2010
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Shares
 
Price
 
Shares
 
Price
 
Shares
 
Price
Outstanding at beginning of year
2,109

 
$
16.39

 
2,292

 
$
14.63

 
3,567

 
$
14.25

Granted
—

 
—

 
90

 
39.11

 
—

 
—

Exercised
(474
)
 
9.06

 
(273
)
 
9.08

 
(1,275
)
 
13.57

Outstanding at end of year
1,635

 
18.51

 
2,109

 
16.39

 
2,292

 
14.63

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at end of year
1,512

 
17.35

 
1,950

 
15.48

 
2,180

 
15.27
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The Company's net income includes the following compensation costs related to share-based compensation arrangements (in thousands):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Gross compensation costs:
 
 
 
 
 
Stock options
$
134

 
$
112

 
$
91

Nonvested stock
1,166

 
630

 
915

Total gross compensation costs
1,300

 
742

 
1,006

 
 
 
 
 
 
Income tax benefits:
 
 
 
 
 
Stock options
(45
)
 
(39
)
 
(33
)
Nonvested stock
(217
)
 
(217
)
 
(328
)
Total income tax benefits
(262
)
 
(256
)
 
(361
)
 
 
 
 
 
 
Net compensation expense
$
1,038

 
$
486

 
$
645

 
 
 
 
 
 
Tax benefit realized from stock options exercised during the year
$
5,841

 
$
2,088

 
$
6,154
Nonvested stock
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Stock Options Acitivity
The following table summarizes the nonvested common stock award activity during 2012, 2011 and 2010 (in thousands, except fair value amounts):
 
2012
 
2011
 
2010
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
 
 
Fair Value
 
 
 
Fair Value
 
 
 
Fair Value
 
Underlying
 
at Date
 
Underlying
 
at Date
 
Underlying
 
at Date
 
Shares
 
of Grant
 
Shares
 
of Grant
 
Shares
 
of Grant
Outstanding at beginning of year
76

 
$
30.74

 
33

 
$
28.50

 
—

 
$
—

Granted
108

 
43.45

 
59

 
31.59

 
63

 
28.50

Vested
(31
)
 
33.04

 
(16
)
 
29.26

 
(30
)
 
28.50

Outstanding at end of year
153

 
39.24

 
76

 
30.74

 
33

 
28.50