Pension And Postretirement Obligations (Summary Of Projected Benefit Obligation And Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employer contributions	$ 400	$ 300	$ 600
Pension Benefits [Member]
Benefit obligation, beginning of year	18,556	16,020
Interest cost	759	860	869
Actuarial losses (income)	1,518	2,602
Benefit payments	(925)	(926)
Benefit obligation, end of year	19,908	18,556	16,020
Fair value of plan assets, beginning of year	11,265	11,690
Actual return on plan	1,648	(28)
Employer contributions	455	529
Fair value of plan assets, end of year	12,443	11,265	11,690
Unfunded status at end of year	(7,465)	(7,291)
Postretirement Benefits [Member]
Benefit obligation, beginning of year	5,143	4,580
Service cost	14	14	11
Interest cost	226	238	246
Actuarial losses (income)	(1,595)	431
Benefit payments	(133)	(120)
Benefit obligation, end of year	3,655	5,143	4,580
Fair value of plan assets, beginning of year	2,167	2,096
Actual return on plan	54	72
Employer contributions	133	120
Fair value of plan assets, end of year	2,221	2,167	2,096
Fair value of plan assets, end of year, with discrepancy		2,168
Unfunded status at end of year	$ (1,434)	$ (2,975)