Debt - Line of Credit (Details) (USD $) In Thousands, unless otherwise specified					9 Months Ended
	Oct. 01, 2011	Dec. 31, 2010	Oct. 01, 2011 Revolving Credit Facility due in 2016 [Member]	Dec. 31, 2010 Revolving Credit Facility due in 2016 [Member]	Oct. 01, 2011 Revolving Credit Facility Due in 2012 [Member]	Jul. 31, 2011 Revolving Credit Facility Due in 2012 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,200,000			$ 800,000
Long-term Line of Credit, Noncurrent		200,000
Line of Credit Facility, Interest Rate Spread at Period End					1.275%
Line of Credit Facility Commitment Fee Percentage					0.225%
Line of Credit Facility, Amount Outstanding	$ 197,000		$ 197,000	$ 0