Income Taxes Reconciliation of unrecognized tax benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ (11,395,000)	$ (17,368,000)	$ (24,028,000)
Additions for tax positions of current year	(280,000)	(2,067,000)	0
Additions for tax positions of prior years	0	(466,000)	0
Reductions for tax positions of current year	0	8,506,000	6,660,000
Reductions for tax positions of prior years	466,000	0	0
Balance, end of year	(11,209,000)	(11,395,000)	(17,368,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Settlements with Taxing Authorities	11,200,000	11,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	3,300,000	2,900,000	2,400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	400,000	400,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	500,000
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	$ 9,000,000