Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Service cost	$ 164,000	$ 136,000	$ 328,000	$ 272,000
Interest cost	357,000	368,000	715,000	736,000
Expected return on plan assets	(497,000)	(475,000)	(994,000)	(950,000)
Amortization of prior service cost	(1,000)	(1,000)	(2,000)	(2,000)
Amortization of Net (Gain)/Loss	192,000	83,000	385,000	166,000
Net periodic benefit cost	215,000	111,000	432,000	222,000
Contribution to pension plan	400,000	156,000	800,000	313,000
Anticipated additional contributions for the remainder of the year	800,000		800,000
Postretirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	13,000	22,000	26,000	44,000
Interest cost	130,000	143,000	260,000	286,000
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(3,000)	(3,000)	(6,000)	(6,000)
Amortization of Net (Gain)/Loss	71,000	55,000	142,000	110,000
Net periodic benefit cost	$ 211,000	$ 217,000	$ 422,000	$ 434,000