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Accumulated Other Comprehensive Loss (Schedule of Amounts Reclassified from Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Equity [Abstract]
Unrealized loss on cash flow hedges, before tax	$ 4,237
Unrealized loss on cash flow hedges, tax expense	(1,267)
Unrealized loss on cash flow hedges, net of tax	$ 2,970

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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