Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Company Contributions	$ 661		$ 661
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	18	18	35	36
Interest cost	72	76	144	152
Expected return on assets	(77)	(77)	(153)	(154)
Amortization of actuarial net loss	25	16	50	32
Net periodic pension cost	38	33	76	66
Defined Benefit Plan, Contributions by Employer	$ 123	$ 76	$ 199	$ 152