Retirement Plans (Components Of Net Periodic Cost And Other Comprehensive Loss (Income)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits	$ 774	$ 731	$ 790
Interest cost	1,819	1,883	1,847
Expected return on plan assets	(2,051)	(2,118)	(2,172)
Amortization of net actuarial loss	1,370	1,052	992
Amortization of prior service cost			22
Total	1,912	1,548	1,479
Net actuarial loss (gain) arising this year	7,449	281	(2,295)
Actuarial loss charged to expense due to settlement			(1,521)
Net actuarial loss amortized this year	(1,370)	(1,052)	(992)
Prior service cost amortized this year			(22)
Recognized in other comprehensive loss (income)	6,079	(771)	(4,830)
Recognized in net periodic cost and other comprehensive loss (income)	7,991	777	(3,351)
Supplemental Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits	20	16	93
Interest cost	159	192	318
Amortization of net actuarial loss	153	148	431
Amortization of prior service cost			(16)
Total	332	356	826
Net actuarial loss (gain) arising this year	464	493	(1,104)
Actuarial loss charged to expense due to settlement		(1,222)	(267)
Net actuarial loss amortized this year	(153)	(148)	(431)
Prior service credit due to curtailment			6
Prior service cost amortized this year			16
Recognized in other comprehensive loss (income)	311	(877)	(1,780)
Recognized in net periodic cost and other comprehensive loss (income)	643	(521)	(954)
Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits	38	38	49
Interest cost	81	89	92
Amortization of net actuarial loss	28	36	43
Total	147	163	184
Net actuarial loss (gain) arising this year	(35)	(79)	(41)
Net actuarial loss amortized this year	(28)	(36)	(43)
Recognized in other comprehensive loss (income)	(63)	(115)	(84)
Recognized in net periodic cost and other comprehensive loss (income)	$ 84	$ 48	$ 100