Retirement Plans (Details) (Pension Plans, Defined Benefit [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,000	$ 18,000	$ 16,000	$ 35,000
Interest cost	65,000	72,000	130,000	144,000
Expected return on assets	(91,000)	(77,000)	(182,000)	(153,000)
Amortization of actuarial net loss	28,000	25,000	56,000	50,000
Net periodic pension cost	10,000	38,000	20,000	76,000
Company contributions	80,000	123,000	203,000	199,000
Anticipated company contributions	$ 400,000		$ 400,000