Summary Of Significant Accounting Policies (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 31, 2012	$ 24,743
Change excluding amounts reclassified from accumulated other comprehensive loss	(16,963)
Amounts reclassified from accumulated other comprehensive loss	(3,578)
Net other comprehensive income	(20,541)		(3,000)	5,969
Balance, December 31, 2013	4,202		24,743
Gain On Investments [Member]
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 31, 2012	0
Change excluding amounts reclassified from accumulated other comprehensive loss	(340)
Amounts reclassified from accumulated other comprehensive loss	0
Net other comprehensive income	(340)
Balance, December 31, 2013	(340)
(Gain) Loss On Cash Flow Hedges [Member]
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 31, 2012	7,489
Change excluding amounts reclassified from accumulated other comprehensive loss	(6,423)
Amounts reclassified from accumulated other comprehensive loss	(2,299)	[1]
Net other comprehensive income	(8,722)
Balance, December 31, 2013	(1,233)
Defined Benefit Pension Plan [Member]
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 31, 2012	17,254
Change excluding amounts reclassified from accumulated other comprehensive loss	(10,200)
Amounts reclassified from accumulated other comprehensive loss	(1,279)	[2]
Net other comprehensive income	(11,479)
Balance, December 31, 2013	$ 5,775

[1] This reclassification component is included in interest expense (see Note 8 for additional information).

[2] This reclassification component is included in the computation of net periodic benefit cost (see Note 19 for additional information).