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Real Estate Properties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Real Estate Properties |  |
Real estate properties, at cost | $ 4,721,591 | $ 3,761,712
Accumulated depreciation | 630,261 | 538,872
Future minimum lease payments |  |
2012 | 395,571 |
2013 | 386,123 |
2014 | 344,834 |
2015 | 330,356 |
2016 | 313,619 |
Thereafter | 2,628,386 |
Land |  |
Real Estate Properties |  |
Real estate properties, at cost | 564,628 | 446,622
Buildings and improvements. |  |
Real Estate Properties |  |
Real estate properties, at cost | 3,969,086 | 3,153,466
Accumulated depreciation | 543,064 | 465,216
Furniture, fixtures and equipment |  |
Real Estate Properties |  |
Real estate properties, at cost | 187,877 | 161,624
Accumulated depreciation | $ 87,197 | $ 73,656

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- Definition Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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