Supplementary Data (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Line Items]
Operating income (loss)	$ 53,100	$ 144,800	$ 309,600	$ 208,100	$ 35,600	$ 180,700	$ 219,800	$ 125,100
Loss on debt extinguishment									0	0	(85,247,000)
Income from discontinued operations, net of tax	0	0	0	0	51,000	0	0	0	0	51,036,000	(113,124,000)
Financial Services Operations [Member]
Quarterly Financial Data [Line Items]
Loss on debt extinguishment											0
Income from discontinued operations, net of tax									$ 0	$ 0	$ 0