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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock-based Compensation [Abstract] |
Summary of Stock Option Activity [Table Text Block] |
|  | 2013 |  | 2012 |  | 2011
Number of shares under the plans: |  |  |  |  |  |
Outstanding and exercisable at beginning of year |  | 22,500 |  | 39,950 |  | 80,950
Granted |  | - |  | - |  | -
Canceled |  | - |  | - |  | -
Exercised |  | (3,750) |  | (17,450) |  | (41,000)
Outstanding and exercisable at end of year |  | 18,750 |  | 22,500 |  | 39,950
Number of shares available for future grant: |  |  |  |  |  |
Beginning of year |  | 561,655 |  | 315,840 |  | 391,881
End of year |  | 557,655 |  | 561,655 |  | 315,840
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
| Options Outstanding and Exercisable
| Number |  | Weighted Average |  | Weighted
Range of Exercise Prices | of Shares |  | Remaining Life |  | Exercise Price
$7.81 - $8.97 | 10,000 |  | 0.9 | $ | 8.39
$9.29 - $14.77 | 8,750 |  | 1.7 |  | 13.20
| 18,750 |  | 1.3 | $ | 10.64
Schedule of Restricted Stock Awards [Table Text Block] |
|  |  |  |  | Aggregate Grant
|  |  | Grant Date |  | Date Fair Value
Grant Date | Shares |  | Share Price |  | (Dollars in Thousands)
March 15, 2011 | 24,836 | $ | 38.46 | $ | 955
July 21, 2011 | 16,600 |  | 38.44 |  | 638
August 29, 2011 | 5,000 |  | 24.50 |  | 123
February 1, 2012 | 66,000 |  | 30.15 |  | 1,990
March 6, 2012 | 18,347 |  | 27.49 |  | 504
May 23, 2012 | 8,000 |  | 28.05 |  | 224
December 11, 2012 | 16,330 |  | 41.98 |  | 686
February 27, 2013 | 12,973 |  | 42.49 |  | 551
Schedule of Performance Unit Awards [Table Text Block] |
|  |  |  |  |  | Aggregate Grant
Incentive |  |  |  | Grant Date |  | Date Fair Value
Plan | Grant Date | Units |  | Share Price |  | (Dollars in Thousands)
2011 - 2013 | March 15, 2011 | 34,002 | $ | 38.46 | $ | 1,308
2012 - 2014 | March 6, 2012 | 43,042 |  | 27.49 |  | 1,183
2013 - 2015 | February 27, 2013 | 31,418 |  | 42.49 |  | 1,335
Schedule of Grants, Average Grant Date Fair Value [Table Text Block] |
|  | Average |  |
|  | Grant date |  |
Incentive Plan |  | Fair Value |  | Ten Day Period
2011 - 2013 |  | 40.25 |  | February 2011
2012 - 2014 |  | 31.80 |  | February 2012
2013 - 2015 |  | 43.57 |  | February 2013

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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