Accumulated Other Comprehensive Earnings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balances at Beginning of Period	$ 109,134	$ 86,999
Unrealized (loss) gain on AFS securities	(3,212)	11,913
Net realized gain on AFS securities reclassified to investment income, net	(9,433)	(3,437)
Amortization of actuarial losses reclassified to operating and administrative expenses	145	84
Net other comprehensive (losses) earnings	(12,500)	8,560
Balances at End of Period	96,634	95,559
AFS Securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balances at Beginning of Period	117,962	94,836
Unrealized (loss) gain on AFS securities	(3,212)	11,913
Net realized gain on AFS securities reclassified to investment income, net	(9,433)	(3,437)
Net other comprehensive (losses) earnings	(12,645)	8,476
Balances at End of Period	105,317	103,312
Postretirement Benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balances at Beginning of Period	(8,828)	(7,837)
Amortization of actuarial losses reclassified to operating and administrative expenses	145	84
Net other comprehensive (losses) earnings	145	84
Balances at End of Period	$ (8,683)	$ (7,753)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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