Fair Value Measurements - Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Total Fair Value Inputs [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	$ 1,585	$ 1,508
Company Owned Life Insurance - Deferred Compensation Assets	441	487
Large Capitalization Registered Investment Companies	59	64
Mid Capitalization Registered Investment Companies	5	4
Small Capitalization Registered Investment Companies	8	7
International Developed And Emerging Markets Registered Investment Companies	32	32
Fixed Income Registered Investment Companies	9	8
Assets, Fair Value Disclosure	2,139	2,110
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Company Owned Life Insurance - Deferred Compensation Assets	0	0
Large Capitalization Registered Investment Companies	59	64
Mid Capitalization Registered Investment Companies	5	4
Small Capitalization Registered Investment Companies	8	7
International Developed And Emerging Markets Registered Investment Companies	32	32
Fixed Income Registered Investment Companies	9	8
Assets, Fair Value Disclosure	113	115
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	1,585	1,508
Company Owned Life Insurance - Deferred Compensation Assets	441	487
Large Capitalization Registered Investment Companies	0	0
Mid Capitalization Registered Investment Companies	0	0
Small Capitalization Registered Investment Companies	0	0
International Developed And Emerging Markets Registered Investment Companies	0	0
Fixed Income Registered Investment Companies	0	0
Assets, Fair Value Disclosure	2,026	1,995
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Company Owned Life Insurance - Deferred Compensation Assets	0	0
Large Capitalization Registered Investment Companies	0	0
Mid Capitalization Registered Investment Companies	0	0
Small Capitalization Registered Investment Companies	0	0
International Developed And Emerging Markets Registered Investment Companies	0	0
Fixed Income Registered Investment Companies	0	0
Assets, Fair Value Disclosure	$ 0	$ 0