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Stock Option Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options, Activity
Combined stock option transactions under both Plans were as follows:
 
 
Years Ended December 31, 
 
2012
2011
2010
 
Options
Weighted Avg.
Exercise Price
Options
Weighted Avg.
Exercise Price
Options
Weighted Avg.
Exercise Price
Outstanding at beginning of year
1,076,067

$
20.86

1,069,774

$
21.74

1,030,267

$
22.92

Granted
241,575

11.50

242,300

12.01

192,900

12.31

Exercised
—

—

—

—

(13,508
)
7.92

Forfeited/expired
(43,911
)
17.25

(236,007
)
15.76

(139,885
)
18.75

Outstanding at end of year
1,273,731

$
19.21

1,076,067

$
20.86

1,069,774

$
21.74

Exercisable at December 31
789,129

$
23.58

670,258

$
25.08

663,259

$
24.63

Options available for grant at December 31
327,184

 

549,003

 

511,525

 

Weighted-average fair value of options
  granted during the year
 
$
5.99

 
$
6.42

 

$
6.47
Shares Authorized under Stock Option Plans, by Exercise Price Range
Exercise prices for options outstanding as of December 31, 2012 are presented in the following table:
 
 
Options
Outstanding
Weighted
Avg. Exercise
 Price
Weighted Avg.
Remaining
Contractual
Life
Options
Exercisable
Weighted
Avg. Exercise
Price
Options with exercise prices ranging from
    $8.46 to $16.41
704,241

$
12.68

7.9 years
220,016

$
13.99

Options with exercise prices ranging from
    $16.42 to $25.38
170,835

21.86

0.7 years
170,458

21.86

Options with exercise prices ranging from
    $25.39 to $33.50
398,655

29.61

3.8 years
398,655

29.61

Total options outstanding with exercise
    prices ranging from $8.46 to $33.50
1,273,731

$
19.21

5.6 years
789,129

$
23.58
Schedule of Nonvested Share Activity
The following table represents nonvested options as of December 31, 2012:
 
 
 
Number of
Shares
Weighted Avg.
Grant Date
Fair Value
Nonvested options,
December 31, 2011
405,809

$
6.84

Granted
 
241,575

5.99

Vested
 
(149,200
)
7.49

Forfeited
 
(13,582
)
6.10

Nonvested options,
December 31, 2012
484,602

$
6.24