Pension And Postretirement Obligations (Components Of Net Periodic Cost (Gain)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 759	$ 860	$ 869
Expected return on plan assets	(876)	(913)	(820)
Amortization of prior service cost	56	56	56
Recognized actuarial gain (loss)	909	755	873
Net periodic benefit cost (gain)	848	758	978
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	14	11
Interest cost	226	238	246
Expected return on plan assets	(173)	(168)	(161)
Amortization of transition asset	28	28	28
Amortization of prior service cost	(330)	(330)	(330)
Recognized actuarial gain (loss)	131	94	94
Net periodic benefit cost (gain)	$ (104)	$ (124)	$ (112)