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Derivative Financial Instruments (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Location and effect of the derivative instrument on the statements of operations
Amount of gain (loss) recognized	$ (366)	$ (250)	$ (741)	$ 373
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	270	2,380	(621)	1,888
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	$ (636)	$ (2,630)	$ (120)	$ (1,515)

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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