Share- Based Compensation (Details 3) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation (Textuals)
Total share-based compensation expense	$ 3,889	$ 3,155	$ 10,506	$ 9,520
Director Deferred Shares [Member]
Director Deferred Shares
Unvested, Shares, Beginning balance			14
Unvested, Weighted-average grant-date fair value, Beginning balance			$ 33.28
Vested, Shares			(14)
Vested, Weighted-average grant-date fair value			$ 33.28
Granted, Shares			31
Granted, Weighted-average grant-date fair value			$ 33.98
Unvested, Shares, Ending balance	31		31
Unvested, Weighted-average grant-date fair value, Ending balance	$ 33.98		$ 33.98
Vested, Shares, Ending balance	83		83
Vested Shares, Weighted Average grant-date fair value, ending balance	$ 33.87		$ 33.87
Outstanding, Shares, Ending balance	114		114
Outstanding Shares, Weighted Average grant-date fair value, ending balance	$ 33.90		$ 33.90

Schedule of share based compensation non employee director stock award plan activity.

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Share based compensation arrangement award other than options outstanding weighted average grant date fair value.

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The number of vested and outstanding awards on non-stock option plans.

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The weighted average fair value as of the grant date of share based award plans other than stock option plans that were vested and outstanding as of the balance sheet date.

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Share based compensation arrangement by share based payment award other than options outstanding number.

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Share-Based Compensation.

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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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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