Hedging Activities and Fair Value Measurements (Schedule of Gains and Losses on Derivatives Designated as Cash Flow Hedges) (Details) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Hedging Activities and Fair Value Measurements
Amount of gain or (loss) recognized in AOCI on derivatives (effective portion)	$ (292)	[1]	$ (825)	[1]	$ (170)	[1]	$ (1,912)	[1]
Amount of gain or (loss) reclassified from AOCI into income (effective portion)	(269)	[1]	(330)	[1]	(551)	[1]	(711)	[1]
Amount of gain or (loss) recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing)		[1]	$ (5)	[1]	$ (1)	[1]	$ (5)	[1]

[1] Losses on derivatives reclassified from accumulated other comprehensive income ("AOCI") into income (effective portion) were included in the interest expense line on the face of the Condensed Consolidated Statements of Operations.