Pension and Other Postretirement Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2007
Defined Benefit Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Vesting percentage in accrued benefits from plan freeze					100.00%
Service cost	$ 44,000	$ 0	$ 87,000	$ 0
Interest cost	232,000	258,000	464,000	517,000
Expected return on plan assets	(267,000)	(259,000)	(535,000)	(518,000)
Amortization of prior service cost	1,000	1,000	2,000	2,000
Amortization of net loss	196,000	126,000	393,000	250,000
Net periodic benefit cost	206,000	126,000	411,000	251,000
Minimum required contribution	1,100,000		1,100,000
Company expected contributions to plans in fiscal year	500,000		500,000
Contributions payable, from prior plan years	400,000		400,000
Company contributions to plan			300,000
Chairman and President Non-Qualified Defined Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	42,000	13,000	84,000	26,000
Interest cost	228,000	266,000	456,000	532,000
Amortization of prior service cost	15,000	129,000	30,000	258,000
Amortization of net loss	286,000	165,000	571,000	329,000
Net periodic benefit cost	571,000	573,000	1,141,000	1,145,000
Company expected contributions to plans in fiscal year	2,000,000		2,000,000
Company contributions to plan			900,000
Aggregate average annual participant salary increase (as a percentage)			10.00%
Defined Benefit Postretirement Healthcare Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	32,000	38,000	65,000	76,000
Amortization of prior service cost	26,000	29,000	52,000	57,000
Amortization of net loss	10,000	0	20,000	0
Net periodic benefit cost	$ 68,000	$ 67,000	$ 137,000	$ 133,000