Summary Of Significant Accounting Policies (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ 12,436	$ 4,202
Change excluding amounts reclassified from accumulated other comprehensive loss				(1,645)	(338)
Amounts reclassified from accumulated other comprehensive loss				(1,762)	(1,486)
Net other comprehensive loss (income)		$ 3,486	$ (534)	(3,407)	(1,824)
Ending balance		9,029	2,378	9,029	2,378
(Gain) Loss On Investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(656)	(340)
Change excluding amounts reclassified from accumulated other comprehensive loss				$ 320	(203)
Amounts reclassified from accumulated other comprehensive loss					38	[1]
Net other comprehensive loss (income)				$ 320	(165)
Ending balance		(336)	(505)	(336)	(505)
(Gain) Loss On Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(3,416)	(1,233)
Change excluding amounts reclassified from accumulated other comprehensive loss				(1,965)	(135)
Amounts reclassified from accumulated other comprehensive loss	[2]			(681)	(1,280)
Net other comprehensive loss (income)				(2,646)	(1,415)
Ending balance		(6,062)	(2,648)	(6,062)	(2,648)
Defined Benefit Pension Plan [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				16,508	5,775
Amounts reclassified from accumulated other comprehensive loss	[3]			(1,081)	(244)
Net other comprehensive loss (income)				(1,081)	(244)
Ending balance		$ 15,427	$ 5,531	$ 15,427	$ 5,531

[1] This reclassification component is included in interest and other income.

[2] This reclassification component is included in interest expense (see Note 6 for additional information).

[3] This reclassification component is included in the computation of net periodic benefit cost (see Note 13 for additional information).