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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | Following is a summary of the activity of the restricted stock:
| Six Months Ended
| June 30, 2012
| Shares |  | Fair Value
Balance at December 31, 2011 | 52,470 |  |  | $ | 29.86
Granted | 25,805 |  |  | $ | 37.43
Vested | (28,154 | ) |  | $ | 28.02
Balance at June 30, 2012 | 50,121 |  |  | $ | 34.79
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | Following is a summary of the activity of the stock options during the six-month period ended June 30, 2012:
|  |  |  | Weighted- |  | Average |  | Aggregate
|  |  |  | Average |  | Remaining |  | Intrinsic
|  |  |  | Exercise |  | Contractual |  | Value
|  | Shares |  | Price |  | Term Years |  | (In thousands)
Outstanding at December 31, 2011 |  | 30,628 |  | $ | 17.79 |  | .84 |  | $ | 545
Exercised |  | 13,192 |  | $ | 16.47 |  |  |  |  |
Outstanding at June 30, 2012 |  | 17,436 |  | $ | 18.79 |  | .52 |  | $ | 374
Exercisable at June 30, 2012 |  | 17,436 |  | $ | 18.79 |  | .52 |  | $ | 374
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Following is a summary of the activity of the non-vested stock options during the six-month period ended June 30, 2012:
|  |  |  |  | Weighted-Average
|  | Shares |  | Grant Date Fair Value
Non-vested at December 31, 2011 |  | 3,674 |  |  | $ | 2.69
Vested |  | (3,674 | ) |  | $ | 2.69
Non-vested at June 30, 2012 |  | — |  |  | $ | 0.00
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] | Following is a summary of the activity of the Company’s SARs program for the six-month period ended June 30, 2012:
|  | Shares |  | Weighted- Average Exercise Price |  | Average Remaining Contractual Term Years |  | Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2011 |  | 332,586 |  |  | $ | 26.87 |  | 7.42 |  | $ | 3,166
Granted |  | 83,968 |  |  | $ | 36.92 |  |  |  |  |
Exercised |  | (12,657 | ) |  | $ | 25.35 |  |  |  |  |
Outstanding at June 30, 2012 |  | 403,897 |  |  | $ | 29.01 |  | 7.52 |  | $ | 4,540
Exercisable at June 30, 2012 |  | 256,366 |  |  | $ | 25.62 |  | 6.54 |  | $ | 3,750
Schedule Of Share Based Compensation Non Vested Stock Appreciation Rights [Table Text Block] | Following is a summary of the activity of the non-vested SARs during the six-month period ended June 30, 2012:
|  | Shares |  | Weighted-Average Grant Date Fair Value
Non-vested at December 31, 2011 |  | 144,321 |  |  | $ | 29.35
Granted |  | 83,968 |  |  | $ | 36.92
Vested |  | (80,758 | ) |  | $ | 27.49
Non-vested at June 30, 2012 |  | 147,531 |  |  | $ | 34.89
Schedule Of Per Share Fair Value Of Stock Appreciation Rights [Table Text Block] | Following are the assumptions used to estimate the per-share fair value of SARs granted:
|  | Six Months Ended June 30,
|  | 2012 |  | 2011
Risk free interest rate |  | 1.38 | % |  | 2.70 | %
Expected life |  | 7 yrs. |  | 7 yrs.
Expected volatility |  | 29.39 | % |  | 27.86 | %
Expected dividend yield |  | 1.84 | % |  | 1.77 | %

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- Definition Tabular disclosure of schedule of per share fair value of stock appreciation rights. + References No definition available. + Details
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- Definition Tabular disclosure of share based compensation non vested stock appreciation r ights. + References No definition available. + Details
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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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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