Asset-Backed Financing (Schedule Of Assets And Liabilities Of Variable Interest Entities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011	Mar. 27, 2011
SPEs [Member]
Asset Backed Financing [Line Items]
Finance receivables	$ 2,564,585	$ 2,916,219	$ 3,000,580
Allowance for credit losses	(56,810)	(65,735)	(81,631)
Restricted cash	245,912	228,776	293,090
Other assets	5,620	6,772	10,499
Total assets	2,759,307	3,086,032	3,222,538
Term asset-backed securitization debt	1,754,320	2,087,346	2,324,763
SPE Facility [Member]
Asset Backed Financing [Line Items]
Finance receivables	10,689	13,455	23,776
Allowance for credit losses	(236)	(302)	(645)
Restricted cash	1,083	879	1,813
Other assets	312	449	598
Total assets	$ 11,848	$ 14,481	$ 25,542