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Share-Based Compensation (Information Pertaining To Option Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-Based Compensation [Abstract]
Weighted average grant-date fair value of stock options granted:	$ 2,438,000	$ 1,477,000
Total fair value of stock options vested:	1,870,000	1,015,000
Total intrinsic value of stock options exercised:	1,793,000	918,000
Total pre-tax share-based compensation expense charged against income:	474,000	467,000
Total unrecognized compensation expense related to non-vested options:	$ 5,422,000	$ 4,950,000

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Grant In Period Weighted Average Grant Date Fair Value.

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Vested Total fair value.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Name Accounting Standards Codification

-Topic 718

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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