Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Other comprehensive loss before reclassifications	$ (61,097)	$ 5,255
Amounts reclassified from accumulated other comprehensive loss	(968)	(1,081)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Expense [Member]
Derivative [Line Items]
Amounts reclassified from accumulated other comprehensive loss	(968)	(1,081)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Other comprehensive loss before reclassifications	$ (272)	$ (295)