Retirement Plans (Fair Value Of Pension Plan Assets By Asset Category) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	28,471		26,858
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	11,062	[1]	10,626	[2]
U.S. Equity Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6,945		6,607
U.S. Equity Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6,952		6,622
Foreign Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,810		2,658
Money Market Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	702		345
Quoted Prices In Active Markets Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	702		345
Quoted Prices In Active Markets Level 1 [Member] | Money Market Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	702		345
Significant Observable Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	27,769		26,513
Significant Observable Inputs Level 2 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	11,062	[1]	10,626	[2]
Significant Observable Inputs Level 2 [Member] | U.S. Equity Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6,945		6,607
Significant Observable Inputs Level 2 [Member] | U.S. Equity Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	6,952		6,622
Significant Observable Inputs Level 2 [Member] | Foreign Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,810		2,658
Significant Unobservable Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets
Significant Unobservable Inputs Level 3 [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets				[2]
Significant Unobservable Inputs Level 3 [Member] | U.S. Equity Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets
Significant Unobservable Inputs Level 3 [Member] | U.S. Equity Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets
Significant Unobservable Inputs Level 3 [Member] | Foreign Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets
Significant Unobservable Inputs Level 3 [Member] | Money Market Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets
U.S. Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of fixed income fund in asset and other securities	41.00%		41.00%
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of fixed income fund in asset and other securities	25.00%		24.00%
Asset And Mortgage-Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of fixed income fund in asset and other securities	34.00%
Mortgage-Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of fixed income fund in asset and other securities			35.00%

[1] As of December 31, 2011, the fixed income fund consisted of a 34% investment in asset and mortgage-backed securities, a 41% investment in U.S. treasury securities, and a 25% investment in corporate bonds.

[2] As of December 31, 2010, the fixed income fund consisted of a 35% investment in asset and mortgage-backed securities, a 41% investment in U.S. treasury securities, and a 24% investment in corporate bonds.