Defined Benefit Pension Plans (Components of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		120 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 30, 2023
Qualified Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 615	$ 538
Interest Cost	732	723
Expected Return on Plan Assets	(1,129)	(1,016)
Amortization of Prior Service Cost	(6)	(6)
Recognized Net Actuarial Loss	312	115
Net Periodic Benefit Cost	524	354
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	20	12
Interest Cost	122	120
Expected Return on Plan Assets	0	0
Amortization of Prior Service Cost	0	0
Recognized Net Actuarial Loss	61	16
Net Periodic Benefit Cost	$ 203	$ 148
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Transition Period Pension Plan Amendment			10 years