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Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Location and effect of the derivative instrument on the statements of operations
Amount of gain (loss) recognized	$ 0	$ (375)
Hedged Item - Debt [Member] \| Interest Expense, Net [Member]
Location and effect of the derivative instrument on the statements of operations
Amount of gain (loss) recognized	0	(891)
Interest Rate Swap [Member] \| Interest Expense, Net [Member]
Location and effect of the derivative instrument on the statements of operations
Amount of gain (loss) recognized	$ 0	$ 516

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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