Defined Benefit Pension Plans (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 731	$ 643	$ 1,461	$ 1,287
Interest Cost	719	706	1,438	1,412
Expected Return on Plan Assets	(924)	(747)	(1,849)	(1,493)
Amortization of Prior Service Cost	(9)	(9)	(17)	(17)
Recognized Net Actuarial Loss	414	247	828	491
Net Periodic Benefit Cost	931	840	1,861	1,680
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	49	37	99	75
Interest Cost	115	126	230	252
Expected Return on Plan Assets	0	0	0	0
Amortization of Prior Service Cost	0	0	0	0
Recognized Net Actuarial Loss	49	30	98	59
Net Periodic Benefit Cost	$ 213	$ 193	$ 427	$ 386