Fair Value Of Financial Instruments (Summary Of Carrying Amount And Fair Value Of Financial Instruments) (Details) (USD $)	3 Months Ended		6 Months Ended										6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Carrying Value [Member]	Dec. 31, 2011 Carrying Value [Member]	Jun. 30, 2012 Fair Value [Member]	Dec. 31, 2011 Fair Value [Member]	Nov. 22, 2011 Interest Rate Swap [Member] agreement	Jun. 30, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Jun. 30, 2012 Accumulated Other Comprehensive Income (Loss) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loss on Derivative Instruments, Pretax	$ 1,000,000		$ 2,000,000
Mortgages and notes payable, carrying value						1,034,086,000	1,042,682,000
Senior notes and debentures, carrying value	1,004,532,000		1,004,532,000		1,004,635,000
Mortgages and notes payable, fair value								1,082,723,000	1,099,273,000
Senior notes and debentures, fair value								1,102,285,000	1,085,309,000
Number of Interest Rate Derivatives Held										2
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	275,000,000		275,000,000
Derivative, Fixed Interest Rate	1.72%		1.72%
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	3,900,000		3,900,000
Interest rate swaps											10,375,000	3,940,000
Other Comprehensive Income (Loss)	$ (7,793,000)	$ 0	$ (6,435,000)	$ 0									$ (6,435,000)