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Real Estate (Tables) | 12 Months Ended
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Dec. 31, 2012
Real Estate [Abstract] |
Real Estate And Accumulated Depreciation |
|  | Years ended December 31,
|  | 2012 |  | 2011
Cost |  |  |  |
Balance, beginning of year (a) |  | $ 1,363,936,000 |  | $ 1,283,287,000
Property acquired |  | 76,185,000 |  | 46,863,000
Improvements and betterments |  | 20,472,000 |  | 33,954,000
Write-off of fully-depreciated assets |  | (99,000) |  | (168,000)
Balance, end of the year |  | $ 1,460,494,000 |  | $ 1,363,936,000
Accumulated depreciation |  |  |  |
Balance, beginning of the year (a) |  | $ (196,661,000) |  | $ (156,917,000)
Depreciation expense |  | (41,189,000) |  | (39,912,000)
Write-off of fully-depreciated assets |  | 99,000 |  | 168,000
Balance, end of the year |  | $ (237,751,000) |  | $ (196,661,000)
Net book value |  | $ 1,222,743,000 |  | $ 1,167,275,000
(a) Restated to reflect the reclassifications of properties subsequently treated as "held for sale/conveyance".

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