Pension and Other Postretirement Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 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	$ 131,000	$ 0
Interest cost	232,000	258,000	696,000	776,000
Expected return on plan assets	(268,000)	(259,000)	(803,000)	(777,000)
Amortization of prior service cost	1,000	1,000	3,000	3,000
Amortization of net loss	196,000	126,000	589,000	374,000
Net periodic benefit cost	205,000	126,000	616,000	376,000
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			700,000
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	9,000	126,000	36,000
Interest cost	228,000	190,000	684,000	722,000
Amortization of prior service cost	14,000	92,000	44,000	350,000
Amortization of net loss	286,000	118,000	857,000	447,000
Net periodic benefit cost	570,000	409,000	1,711,000	1,555,000
Company expected contributions to plans in fiscal year	2,000,000		2,000,000
Company contributions to plan			1,300,000
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	97,000	113,000
Amortization of prior service cost	25,000	28,000	77,000	85,000
Amortization of net loss	11,000	0	31,000	0
Net periodic benefit cost	$ 68,000	$ 66,000	$ 205,000	$ 198,000