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Employee Benefit Plans (Fair Value Of Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 137,253	$ 141,050	$ 128,044	$ 106,489
Level 1 [Member] \| U.S. Treasury [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,562
Level 1 [Member] \| Corporate Bonds And Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,973	10,625
Level 1 [Member] \| Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		53,162
Level 1 [Member] \| Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	127,022	68,312
Level 1 [Member] \| Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,091	4,434
Level 2 [Member] \| U.S. Government Agency Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	896	955
Level 2 [Member] \| States And Political Subdivisions [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 271

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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