Derivative Instruments And Hedging Activities (Summary Of Gains And Losses Recorded In Interest Expense And Other Comprehensive Income) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments And Hedging Activities [Abstract]
Loss reclassified from accumulated other comprehensive income				$ 1,899,000
Loss from changes in the fair value of the ineffective portion of the interest rate swap		54,000		170,000
Total loss included in interest expense		54,000		2,069,000
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
Interest rate swap, maturity date			Dec. 22, 2010