Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of net periodic benefit cost [Abstract]
Contribution to pension plan			$ 1,600,000
Anticipated additional contributions for the remainder of the year	0		0
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	164,000	135,000	492,000	407,000
Interest cost	357,000	380,000	1,071,000	1,116,000
Expected return on plan assets	(497,000)	(479,000)	(1,491,000)	(1,429,000)
Amortization of prior service cost	(1,000)	(1,000)	(3,000)	(3,000)
Amortization of Net (Gain)/Loss	192,000	107,000	576,000	274,000
Net periodic benefit cost	215,000	142,000	645,000	365,000
Postretirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	13,000	(2,000)	39,000	42,000
Interest cost	130,000	140,000	390,000	426,000
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(3,000)	(3,000)	(9,000)	(9,000)
Amortization of Net (Gain)/Loss	71,000	52,000	213,000	162,000
Net periodic benefit cost	$ 211,000	$ 187,000	$ 633,000	$ 621,000