Real Estate And Accumulated Depreciation (Reconciliation Of Real Estate Owned And Accumulated Depreciation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Real Estate And Accumulated Depreciation [Abstract]
Balance at Beginning of Year	$ 799,506,000	$ 781,664,000	$ 921,433,000
Amounts Capitalized	28,309,000	32,215,000	15,841,000
Impairments	(377,270,000)	(4,297,000)	(93,565,000)
Amounts Retired or Adjusted	(21,114,000)	(10,076,000)	(62,045,000)
Balance at Close of Period	429,431,000	799,506,000	781,664,000
Balance at Beginning of Year	41,992,000	35,000,000	33,235,000
Depreciation Expense	12,215,000	9,453,000	10,474,000
Amounts Retired Or Adjusted Accumulated Depreciation	(9,718,000)	(2,461,000)	(8,709,000)
Balance at Close of Period	44,489,000	41,992,000	35,000,000
Aggregate cost of real estate owned for federal income tax purposes	$ 737,000,000