Fair Value Measurements (Derivatives - Fair Value and Designation) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption [Member] | Other Assets [Member]
Derivative Asset, Fair Value, Net [Abstract]
interest rate swaptions	$ 0	$ 197
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	1,226	958
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Accrued Liabilities [Member]
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	517	559
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivative Liability, Fair Value, Net [Abstract]
Interest rate swaps	$ 709	$ 399