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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Transactions of the Company's stock option plans
The following table summarizes the transactions of the Company’s stock option plans for the three-year period ended December 31, 2013: 
 
Number of shares
 
Weighted-average
exercise price
Options outstanding —
 
 
 
December 31, 2010
251,250

 
$
26.59

Options granted
31,500

 
$
36.59

Options exercised
(33,180
)
 
$
7.07

Options forfeited
(4,480
)
 
38.20

Options outstanding —
 
 
 
December 31, 2011
245,090

 
$
30.30

Options granted
45,100

 
$
36.15

Options exercised
(37,450
)
 
$
10.25

Options forfeited
(5,160
)
 
$
37.19

Options outstanding —
 
 
 
December 31, 2012
247,580

 
$
34.26

Options granted
23,258

 
$
51.29

Options exercised
(66,660
)
 
$
24.91

Options forfeited
(1,800
)
 
$
37.78

Options outstanding —
 
 
 
December 31, 2013
202,378

 
$
39.27

Price range $9.14 — $36.15
 
 
 
(weighted-average contractual life of 6.3 years)
67,560

 
$
32.58

Price range $36.16 — $38.41
 
 
 
(weighted-average contractual life of 6.8 years)
57,260

 
$
37.57

Price range $38.42 — $52.81
 
 
 
(weighted-average contractual life of 6.2 years)
77,558

 
$
46.35

Options outstanding - December 31, 2013
202,378

 
 
Exercisable options —
 
 
 
December 31, 2011
152,762

 
$
25.29

December 31, 2012
141,740

 
$
31.72

December 31, 2013
113,060

 
$
38.18
Assumptions used for valuing options
The following assumptions were used for valuing options granted in the years ended December 31:
Aggregate intrinsic value related to stock options
The following table summarizes the aggregate intrinsic value related to options exercised, outstanding and exercisable as of and for the years ended December 31:
 
2013
 
2012
 
(In thousands)
Exercised
$
1,743

 
$
950

Outstanding
$
3,083

 
$
3,371

Exercisable
$
1,846

 
$
2,316
Transactions of the Company's restricted stock
The fair value of nonvested shares is determined based on the market price of the shares on the grant date.
 
Shares
 
Fair value
per share
Nonvested at December 31, 2010
47,900

 
$
41.52

Granted
28,650

 
$
36.59

Vested
(10,900
)
 
$
51.26

Forfeited
(2,350
)
 
$
39.30

Nonvested at December 31, 2011
63,300

 
$
37.69

Granted
30,325

 
$
36.15

Vested
(17,900
)
 
$
38.69

Forfeited
(1,900
)
 
$
21.77

Nonvested at December 31, 2012
73,825

 
$
37.01

Granted
21,425

 
$
51.12

Vested
(16,875
)
 
$
38.41

Forfeited
(3,900
)
 
$
37.69

Nonvested at December 31, 2013
74,475

 
$
40.54