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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2013
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:
|  | Three Months Ended
|  | March 31, 2013
|  | Shares |  | Fair Value
Balance at December 31, 2012 |  | 54,875 |  |  | $ | 31.61
Granted |  | 21,804 |  |  | $ | 42.14
Vested |  | (18,959 | ) |  | $ | 30.68
Balance at March 31, 2013 |  | 57,720 |  |  | $ | 35.90
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | Following is a summary of the activity of the Company’s SARs program for the three-month period ended March 31, 2013:
|  |  |  |  | Weighted- |  | Average |  | Aggregate
|  |  |  |  | Average |  | Remaining |  | Intrinsic
|  |  |  |  | Exercise |  | Contractual |  | Value
|  | Shares |  | Price |  | Term Years |  | (In thousands)
Outstanding at December 31, 2012 |  | 351,881 |  |  | $ | 27.52 |  | 7.34 |  | $ | 4,988
Granted |  | 85,943 |  |  | $ | 42.14 |  |  |  |  |
Exercised |  | (3,192 | ) |  | $ | 29.66 |  |  |  |  |
Outstanding at March 31, 2013 |  | 434,632 |  |  | $ | 30.40 |  | 7.60 |  | $ | 5,061
Exercisable at March 31, 2013 |  | 257,504 |  |  | $ | 25.78 |  | 6.46 |  | $ | 4,187
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | Following is a summary of the activity of the non-vested SARs during the three-month period ended March 31, 2013:
|  |  |  |  | Weighted-Average
|  | Shares |  | Grant Date Fair Value
Non-vested at December 31, 2012 |  | 161,294 |  |  | $ | 31.70
Granted |  | 85,943 |  |  | $ | 42.14
Vested |  | (70,109 | ) |  | $ | 30.85
Non-vested at March 31, 2013 |  | 177,128 |  |  | $ | 37.11
Schedule Of Per Share Fair Value Of Stock Appreciation Rights [Table Text Block] | Following is a summary of the activity of the non-vested SARs during the three-month period ended March 31, 2013:
|  |  |  |  | Weighted-Average
|  | Shares |  | Grant Date Fair Value
Non-vested at December 31, 2012 |  | 161,294 |  |  | $ | 31.70
Granted |  | 85,943 |  |  | $ | 42.14
Vested |  | (70,109 | ) |  | $ | 30.85
Non-vested at March 31, 2013 |  | 177,128 |  |  | $ | 37.11
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] | The Company uses the Black-Scholes pricing model to determine the fair value of the SARs at the date of grant. Following are the assumptions used to estimate the per-share fair value of SARs granted:
|  | Three Months Ended March 31,
|  | 2013 |  | 2012
Risk-free interest rate |  | 1.29 | % |  | 1.38 | %
Expected life |  | 7 yrs. |  | 7 yrs.
Expected volatility |  | 28.72 | % |  | 29.39 | %
Expected dividend yield |  | 1.71 | % |  | 1.84 | %

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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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