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Share-based Compensation (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Share-Based Compensation

Summary of Share Options Outstanding and Exercisable

		Options Outstanding				Weighted Average Exercise  / Grant Price				Nonvested Share Awards Outstanding				Weighted Average Exercise / Grant Price
Total options and nonvested share awards outstanding at December 31, 2010			1,837,990			$	42.39				741,505			$	42.16
Granted			—				—				339,143				56.92
Exercised/vested			(327,454	)			42.89				(235,083	)			46.74
Forfeited			—				—				(11,626	)			42.76
Net activity			(327,454	)							92,434
Total options and nonvested share awards outstanding at June 30, 2011			1,510,536			$	42.29				833,939			$	46.86

Summary of Share Incentive Plans

		Outstanding Options (1)								Exercisable Options (1)
Range of Exercise Prices		Number				Weighted Average Price				Number				Weighted Average Price
$30.06-$41.91			550,956			$	33.04				257,251			$	36.43
$42.90-$44.00			342,063				43.53				304,800				43.48
$45.53-$73.32			617,517				49.85				464,366				50.45
Total options			1,510,536			$	42.29				1,026,417			$	44.87

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- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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- Definition

All required disclosures by grouped ranges of option exercise prices, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph f

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