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Employee Benefit Plans Fair Value Of PLan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	25.00%	55.00%
Fair value plan assets	$ 55,102	$ 57,011
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities	55.00%	45.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Other	20.00%
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	15,708	29,727
Defined Benefit Plan, Actual Plan Asset Allocations	28.50%	52.10%
Equity Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	9,706	14,362
Mututal Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	6,002	15,365
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	28,627	27,284
Defined Benefit Plan, Actual Plan Asset Allocations	52.00%	47.90%
Money Market Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	8,115	2,482
Fixed Income Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	7,983	11,668
Corporate Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	6,813	6,194
US Government Agencies Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	5,716	6,940
Other Alternative Investment Mutual Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value plan assets	$ 10,767	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations	19.50%	0.00%

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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