Pension Plan (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Components of net periodic pension costs
Interest cost	$ 260,000	$ 265,000	$ 520,000	$ 538,000
Expected return on plan assets	(291,000)	(320,000)	(582,000)	(639,000)
Recognized net actuarial loss	222,000	166,000	458,000	343,000
Net periodic cost	191,000	111,000	396,000	242,000
Required Contributions made	$ 200,000	$ 400,000	$ 200,000	$ 600,000