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Properties, net (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Properties |  |
Operating properties, net | $ 2,705,335 | $ 2,597,666
Operating properties, net |  |
Properties |  |
Less: accumulated depreciation | (576,299) | (555,975)
Operating properties, net | Land |  |
Properties |  |
Gross | 431,152 | 427,766
Operating properties, net | Buildings and improvements |  |
Properties |  |
Gross | $ 2,850,482 | $ 2,725,875

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- Definition Carrying amount of income producing properties held for rental. + 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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