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Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Roll-Forward of Outstanding Restricted Stock Grants Issued | The following table represents a roll-forward of outstanding Restricted Stock and related activity during the six months ended June 30, 2014 and the year ended December 31, 2013:
| Shares |  | Weighted-Average Grant Date Price per Share
Outstanding Restricted Stock as of December 31, 2012 | 319,988 |  |  | $ | 74.22 |
Grants issued | 32,000 |  |  | 85.63 |
Grants vested | (39,749 | ) |  | 80.77 |
Grants forfeited | (140 | ) |  | 77.81 |
Outstanding Restricted Stock as of December 31, 2013 | 312,099 |  |  | $ | 74.17 |
Grants issued | 32,913 |  |  | 119.59 |
Grants vested | (10,087 | ) |  | 56.27 |
Grants forfeited | (6,313 | ) |  | 78.24 |
Total outstanding Restricted Stock as of June 30, 2014 | 328,612 |  |  | $ | 79.55 |
Expense Recognition of Deferred Compensation | Compensation expense recognition of deferred equity compensation over the remaining service periods is as follows:
Six Months Remaining In |  |  |  |  |  |  |  |  |  |  |  |
2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | Total
$ | 2,900,620 |  |  | $ | 4,771,915 |  |  | $ | 2,082,773 |  |  | $ | 1,474,020 |  |  | $ | 741,983 |  |  | $ | 149,871 |  |  | $ | 12,121,182 |
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] | The following table represents stock grant transactions during the six months ended June 30, 2014 and 2013:
| Shares Issued |  | Grant Date Value
June 30, 2014 | 33,745 |  |  | $ | 3,984,817 |
June 30, 2013 | 59,006 |  |  | 4,606,008 |
Summary of Company's Expenses Attributable to 401(k) Plan | The following table summarizes the Company’s expenses attributable to the plan during the three and six months ended June 30, 2014 and 2013:
| June 30, 2014 |  | June 30, 2013
Three Months Ended | $ | 334,259 |  |  | $ | 284,569 |
Six Months Ended | 658,003 |  |  | 564,782 |

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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 Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested 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 (d)(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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