Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Benefit Plans [Abstract]
Service cost	$ 789,000	$ 924,000	$ 2,720,000	$ 2,707,000
Interest cost	725,000	686,000	2,615,000	2,022,000
Expected return on plan assets	(405,000)	(253,000)	(1,630,000)	(759,000)
Prior service cost	(22,000)	(21,000)	(92,000)	(63,000)
Recognized loss	151,000	164,000	613,000	493,000
Total	1,238,000	1,500,000	4,226,000	4,400,000
Employer contributions to qualified retirement plan			$ 2,200,000	$ 2,000,000
Deferred compensation arrangements overall description			We also have a deferred compensation plan for eligible employees allowing them to defer portions of their current cash salary or share-based compensation. Deferred amounts are deposited in a grantor trust, which are included in other net assets, and are reported as compensation expense in the year service is rendered. Cash deferrals are invested based on the employee's investment selections from a mix of assets based on a broad market diversification model. Deferred share-based compensation cannot be diversified, and distributions from this plan are made in the same form as the original deferral. See Note 16 for the disclosures associated with the fair value of the deferred compensation plan.

Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) (USD $)

3 Months Ended

9 Months Ended

Sep. 30, 2011

Sep. 30, 2010

Sep. 30, 2011

Sep. 30, 2010

Employee Benefit Plans [Abstract]

Service cost

$ 789,000

$ 924,000

$ 2,720,000

$ 2,707,000

Interest cost

725,000

686,000

2,615,000

2,022,000

Expected return on plan assets

(405,000)

(253,000)

(1,630,000)

(759,000)

Prior service cost

(22,000)

(21,000)

(92,000)

(63,000)

Recognized loss

151,000

164,000

613,000

493,000

Total

1,238,000

1,500,000

4,226,000

4,400,000

Employer contributions to qualified retirement plan

$ 2,200,000

$ 2,000,000

Deferred compensation arrangements overall description

We also have a deferred compensation plan for eligible employees allowing them to defer portions of their current cash salary or share-based compensation. Deferred amounts are deposited in a grantor trust, which are included in other net assets, and are reported as compensation expense in the year service is rendered. Cash deferrals are invested based on the employee's investment selections from a mix of assets based on a broad market diversification model. Deferred share-based compensation cannot be diversified, and distributions from this plan are made in the same form as the original deferral. See Note 16 for the disclosures associated with the fair value of the deferred compensation plan.

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References+ Details

- Definition

The amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

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+ Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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-Name Accounting Standards Codification

-Topic 715

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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+ Details