Real Estate And Accumulated Depreciation (Changes In Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at beginning of year	$ 1,040,839	$ 1,059,531	$ 971,249
Additions at cost	130,698	130,965	133,220
Retirements or sales	(81,094)	(157,723)	(23,418)
Property held for sale	(32,403)	0	(21,520)
Property transferred from held for sale	0	8,066	0
Balance at end of year	$ 1,058,040	$ 1,040,839	$ 1,059,531