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Derivative Instruments (Financial Information Related To Cash Flow Hedges) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Cash Flow Hedge [Member]	Apr. 02, 2011 Cash Flow Hedge [Member]
Derivative [Line Items]
Unrealized losses on hedging transactions, Gross	$ 817	$ 7,355	$ (6,538)	$ (4,419)
Unrealized losses on hedging transactions, Income tax expense (benefit)	204	2,096	(1,892)	(1,663)
Unrealized losses on hedging transactions, Net	$ 613	$ 5,259	$ (4,646)	$ (2,756)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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