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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of restricted share awards under LTIP | A summary of the restricted share awards for the year ended December 31, 2012 is as follows:
|  | Restricted Share Awards |
|  | Performance |  |  |  |  |  | Total |  |  | Weighted-Average |
|  | and Service |  |  | Service |  |  | Restricted |  |  | Grant-Date |
|  | Required |  |  | Required |  |  | Awards |  |  | Fair Value |
Nonvested as of January 1, 2012 |  |  | 128,567 |  |  |  | 14,078 |  |  |  | 142,645 |  |  | $ | 37.75 |
Granted |  |  | 41,627 |  |  |  | 4,588 |  |  |  | 46,215 |  |  |  | 60.77 |
Vested |  |  | (66,973 | ) |  |  | (7,303 | ) |  |  | (74,276 | ) |  |  | 35.75 |
Forfeited |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0.00 |
Nonvested as of December 31, 2012 |  |  | 103,221 |  |  |  | 11,363 |  |  |  | 114,584 |  |  | $ | 48.33 |
Weighted-average Assumptions for estimating fair values | The fair values for the stock options granted in 2012, 2011 and 2010 were estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Risk-free interest rate |  |  | 1.3 | % |  |  | 1.4 | % |  |  | 2.9 | %
Dividend yield |  |  | 1.9 | % |  |  | 1.9 | % |  |  | 2.0 | %
Expected life (years) |  |  | 6 |  |  |  | 6 |  |  |  | 6 |
Expected volatility |  |  | 47.0 | % |  |  | 47.1 | % |  |  | 43.3 | %
The 1999 Stock Option Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Activity in company's plan | Activity in the Company’s 1999 Stock Option Plan for the year ended December 31, 2012 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2012 |  |  | 49,907 |  |  | $ | 34.39 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (17,757 | ) |  | $ | 22.55 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at December 31, 2012 |  |  | 32,150 |  |  | $ | 40.93 |  |  |  | 4.4 |  |  | $ | 595 |
Exercisable at December 31, 2012 |  |  | 32,150 |  |  | $ | 40.93 |  |  |  | 4.4 |  |  | $ | 595 |
Long Term Incentive Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Activity in company's plan | Activity in the Company’s LTIP plan for the year ended December 31, 2012 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2012 |  |  | 27,000 |  |  | $ | 48.21 |  |  |  |  |  |  |  |  |
Granted |  |  | 8,000 |  |  | $ | 57.28 |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,250 | ) |  | $ | 52.10 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at December 31, 2012 |  |  | 33,750 |  |  | $ | 50.21 |  |  |  | 8.8 |  |  | $ | 311 |
Exercisable at December 31, 2012 |  |  | 17,375 |  |  | $ | 46.00 |  |  |  | 8.3 |  |  | $ | 233 |

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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 share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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