Retirement Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 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	53	54
Interest cost	72	76	216	228
Expected return on assets	(77)	(77)	(230)	(231)
Amortization of actuarial net loss	25	16	75	48
Net periodic pension cost	38	33	114	99
Defined Benefit Plan, Contributions by Employer	$ 339	$ 116	$ 538	$ 268