Summary Of Significant Accounting Policies (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward]
Gain And Losses On Cash Flow Hedges - Beginning balance	$ 7,489
Gains And Losses On Cash Flow Hedges - Amounts reclassified from other comprehensive loss (income)	1,451	[1]
Gain And Losses On Cash Flow Hedges - Net other comprensive loss (income)	1,451
Gain And Losses On Cash Flow Hedges - Ending balance	8,940
Defined Benefit Pension Plan - Beginning balance	17,254
Defined Benefit Pension Plan - Amounts reclassified from other comprehensive loss (income)	(365)	[2]
Defined Benefit Pension Plan - Net other comprehensive loss (income)	(365)		0
Defined Benefit Pension Plan - Ending balance	16,889
Total - Beginning balance	24,743
Total - Amounts reclassified from other comprehensive loss (income)	1,086
Total - Net other comprehensive loss (income)	1,086		(675)
Total - Ending balance	$ 25,829

[1] This reclassification component is included in interest expense and other liabilities (see Note 7 for additional information).

[2] This reclassification component is included in the computation of net periodic benefit cost (see Note 14 for additional information).