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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock-Based Compensation [Abstract] |
Roll-forward of outstanding restricted stock grants issued |
|  | Shares |  |  | Weighted-Average Grant Date Price per Share |
Outstanding restricted stock grants as of December 31, 2011 |  |  | 260,621 |  |  | $ | 73.78 |
Grants issued |  |  | 107,600 |  |  |  | 75.64 |
Grants vested |  |  | (46,056 | ) |  |  | 75.22 |
Grants forfeited |  |  | (2,177 | ) |  |  | 71.37 |
Total outstanding restricted stock grants as of December 31, 2012 |  |  | 319,988 |  |  | $ | 74.22 |
Expense recognition of deferred compensation |
2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | Total |
$ | 4,666,887 |  |  | $ | 4,349,048 |  |  | $ | 3,444,556 |  |  | $ | 1,605,186 |  |  | $ | 763,793 |  |  | $ | 14,829,470 |
Summary of company expenses attributable to the 401(k) Plan |
2012 |  |  | 2011 |  |  | 2010 |
$ | 1,044,255 |  |  | $ | 960,888 |  |  | $ | 897,843 |
Summary of warrant transactions |
|  | Warrants |
|  |  |  |  | Weighted Average |
|  | Shares |  |  | Exercise Price |
Oustanding December 31, 2009 |  |  | 6,000 |  |  | $ | 10.42 |
Exercisable December 31, 2009 |  |  | 6,000 |  |  | $ | 10.42 |
Granted |  |  | — |  |  |  | — |
Expired / Forfeited |  |  | 4,000 |  |  |  | 10.00 |
Exercised |  |  | 2,000 |  |  |  | 11.25 |
Oustanding December 31, 2010 |  |  | — |  |  | $ | — |
Exercisable December 31, 2010 |  |  | — |  |  | $ | — |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -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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