Retirement Plans (Details) (Pension Plans, Defined Benefit [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,000	$ 18,000
Interest cost	65,000	72,000
Expected return on assets	(91,000)	(77,000)
Amortization of actuarial net loss	28,000	25,000
Net periodic pension cost	10,000	38,000
Company contributions	123,000	76,000
Anticipated company contributions	$ 400,000