Credit Facilities and Restricted Cash - Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 01, 2012
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 100.0
Line of credit facility, expiration date	April 2016
Line of credit facility, additional borrowing capacity	50.0
Line of credit facility, maximum borrowing capacity	150.0
Line of credit facility, amount outstanding	0
Credit Agreement Subfacility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 50.0