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Real Estate (Real Estate And Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cost      
Balance, beginning of year $ 1,413,402,000 [1] $ 1,316,927,000 [1]  
Property acquired 34,666,000 [2] 76,185,000 [2] 46,863,000 [2]
Land parcel sold (1,351,000) [2]    
Improvements and betterments 12,133,000 [2] 20,389,000 [2] 33,164,000 [2]
Write-off of fully-depreciated assets (18,996,000) (99,000)  
Balance, end of year 1,439,854,000 1,413,402,000 [1] 1,316,927,000 [1]
Accumulated depreciation      
Balance, beginning of the year (229,535,000) [1] (189,608,000) [1]  
Depreciation expense (41,066,000) [2],[3] (40,026,000) [2],[3] (38,768,000) [2],[3]
Write-off of fully-depreciated assets 18,996,000 [2] 99,000 [2] 168,000 [2]
Balance, end of the year (251,605,000) (229,535,000) [1] (189,608,000) [1]
Net book value $ 1,188,249,000 [2] $ 1,183,867,000 [2] $ 1,127,319,000 [2]
[1] Restated to reflect the reclassifications of properties subsequently treated as "held for sale/conveyance".
[2] Restated to reflect the reclassifications of properties to "real estate held for sale/conveyance" during 2013.
[3] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.