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Derivatives (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Location and amount of gains (losses) on derivative instruments and related hedged items
Total	$ 0	$ 0	$ 0
Interest expense [Member] \| Interest rate swap [Member]
Location and amount of gains (losses) on derivative instruments and related hedged items
Derivative: Interest rate swap	6,414	3,328	(6,290)
Interest expense [Member] \| Fixed-rate debt [Member]
Location and amount of gains (losses) on derivative instruments and related hedged items
Hedged item: Fixed-rate debt	$ (6,414)	$ (3,328)	$ 6,290

Amount of unrealized gain (loss) included in earnings for the period related to the fair value of the hedged item in an interest rate fair value hedge, which was offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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