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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Stock-Based Compensation [Abstract]

Roll-forward of outstanding restricted stock grants issued

						Weighted-Average
						Grant Date Price
		Shares				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
Outstanding restricted stock grants as of December 31, 2012			319,988			$	74.22
Grants issued			10,000				77.81
Grants vested			—				—
Grants forfeited			—				—
Total outstanding restricted stock grants as of March 31, 2013			329,988			$	74.33

Expense recognition of deferred compensation

Nine Months Remaining In 2013		2014				2015				2016				2017				2018				Total
$    3,565,008		$	4,504,668			$	3,600,176			$	1,760,806			$	919,413			$	38,905			$	14,388,976

Summary of Company expenses attributable to the 401(k) Plan

		March 31,				March 31,
		2013				2012
Three Months Ended		$	280,213			$	252,919

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- Definition

Schedule of expense recognition of deferred compensation arrangement.

+ References

No definition available.

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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

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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

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