Defined Benefit Pension Plans (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 644	$ 579	$ 1,931	$ 1,736
Interest Cost	705	645	2,117	1,934
Expected Return on Plan Assets	(746)	(699)	(2,239)	(2,096)
Amortization of Prior Service Cost	(8)	(8)	(25)	(25)
Recognized Net Actuarial Loss	246	98	737	294
Net Periodic Benefit Cost	841	615	2,521	1,843
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	38	18	113	54
Interest Cost	126	124	378	372
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Cost	(1)	(1)	(1)	(1)
Recognized Net Actuarial Loss	29	5	88	11
Net Periodic Benefit Cost	$ 192	$ 146	$ 578	$ 436