Derivative Instruments And Hedging Activities (Summary Of Gains And Losses Recorded In Interest Expense And Other Comprehensive Income) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments And Hedging Activities
Loss reclassified from accumulated other comprehensive income				$ 1,899,000
(Gain) loss from changes in the fair value of the ineffective portion of the interest rate swap		(18,000)		116,000
Total loss included in interest expense		(18,000)		2,015,000
Realized loss reclassified to interest expense, net of taxes				302,000
Unrealized loss reclassified to interest expense, net of taxes				904,000
Gain included in other comprehensive income				1,206,000
Notional amount of interest rate swap outstanding	$ 57,500,000		$ 57,500,000