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Real Estate (Real Estate And Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cost      
Balance, beginning of year $ 1,363,936,000 [1] $ 1,283,287,000 [1]  
Property acquired 76,185,000 [2] 46,863,000 [2]  
Improvements and betterments 20,472,000 [2] 33,954,000 [2] 17,631,000 [2]
Write-off fully-depreciated assets (99,000) [2] (168,000) [2] (910,000) [2]
Balance, end of year 1,460,494,000 1,363,936,000 [1] 1,283,287,000 [1]
Accumulated depreciation      
Balance, beginning of the year (196,661,000) [1] (156,917,000) [1]  
Depreciation expense (41,189,000) [2] (39,912,000) [2] (32,138,000) [2]
Write-off of fully-depreciated assets 99,000 [2] 168,000 [2] 910,000 [2]
Balance, end of the year (237,751,000) (196,661,000) [1] (156,917,000) [1]
Real estate, net $ 1,222,743,000 [2] $ 1,167,275,000 [2] $ 1,126,370,000 [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 2012.