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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Summary of Restricted Share Awards under LTIP | A summary of the restricted share awards under the LTIP for the nine month period ended September 30, 2013 is as follows:
|  | Restricted Share Awards |
|  |  |  |  |  |  |  | Total |  |  | Weighted-Average |
|  | Performance |  |  | Service |  |  | Restricted |  |  | Grant-Date |
|  | Required |  |  | Required |  |  | Awards |  |  | Fair Value |
Nonvested as of January 1, 2013 |  |  | 103,221 |  |  |  | 11,363 |  |  |  | 114,584 |  |  | $ | 48.33 |
Granted |  |  | 47,832 |  |  |  | 5,614 |  |  |  | 53,446 |  |  |  | 70.27 |
Vested |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Forfeited |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Nonvested as of September 30, 2013 |  |  | 151,053 |  |  |  | 16,977 |  |  |  | 168,030 |  |  | $ | 55.31 |
Stock Options [Member] |
Activity in Company's Plan | Activity in the Company’s 1999 Stock Option Plan for the nine month period ended September 30, 2013 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, 2013 |  |  | 32,150 |  |  | $ | 40.93 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (12,400 | ) |  | $ | 42.73 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at September 30, 2013 |  |  | 19,750 |  |  | $ | 39.80 |  |  |  | 3.5 |  |  | $ | 635 |
Exercisable at September 30, 2013 |  |  | 19,750 |  |  | $ | 39.80 |  |  |  | 3.5 |  |  | $ | 635 |
Long Term Incentive Plan [Member] |
Activity in Company's Plan | Activity in the Company’s LTIP for the nine month period ended September 30, 2013 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, 2013 |  |  | 33,750 |  |  | $ | 50.21 |  |  |  |  |  |  |  |  |
Granted |  |  | 0 |  |  |  | 0.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (12,750 | ) |  |  | 43.76 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  |  | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at September 30, 2013 |  |  | 21,000 |  |  | $ | 54.13 |  |  |  | 8.5 |  |  | $ | 374 |
Exercisable at September 30, 2013 |  |  | 8,625 |  |  | $ | 54.55 |  |  |  | 8.5 |  |  | $ | 150 |

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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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