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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 710	$ 644	$ 2,171	$ 1,931
Interest Cost	722	705	2,160	2,117
Expected Return on Plan Assets	(931)	(746)	(2,780)	(2,239)
Amortization of Prior Service Cost	17	(8)	0	(25)
Recognized Net Actuarial Loss	354	246	1,182	737
Defined Benefit Plan, Curtailments	(61)	0	(61)	0
Net Periodic Benefit Cost	811	841	2,672	2,521
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	48	38	147	113
Interest Cost	116	126	346	378
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Cost	0	(1)	0	(1)
Recognized Net Actuarial Loss	47	29	145	88
Defined Benefit Plan, Curtailments	(2)	0	(2)	0
Net Periodic Benefit Cost	$ 209	$ 192	$ 636	$ 578