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Real estate (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land and land improvements | $ 1,262,381 | $ 1,313,740 |
Buildings and improvements | 1,964,267 | 2,030,932 |
Less: accumulated depreciation and amortization | (427,625) | (396,761) |
Real estate, net | 2,799,023 | 2,947,911 | 2,642,038
Real estate available and held for sale | 635,865 | 677,458 | 746,081
Total real estate | 3,434,888 | 3,625,369 | 3,388,119
Net Lease Assets |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements | 344,239 | 378,458 |
Buildings and improvements | 1,295,081 | 1,394,691 |
Less: accumulated depreciation and amortization | (315,699) | (302,851) |
Real estate, net | 1,323,621 | 1,470,298 |
Real estate available and held for sale | 0 | 0 |
Total real estate | 1,323,621 | 1,470,298 |
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements | 132,028 | 84,010 |
Buildings and improvements | 669,186 | 636,241 |
Less: accumulated depreciation and amortization | (109,634) | (90,383) |
Real estate, net | 691,580 | 629,868 |
Real estate available and held for sale | 454,587 | 551,998 |
Total real estate | 1,146,167 | 1,181,866 |
Land |  |  |
Real Estate Properties [Line Items] |  |  |
Land and land improvements | 786,114 | 851,272 |
Buildings and improvements | 0 | 0 |
Less: accumulated depreciation and amortization | (2,292) | (3,527) |
Real estate, net | 783,822 | 847,745 |
Real estate available and held for sale | 181,278 | 125,460 |
Total real estate | $ 965,100 | $ 973,205 |

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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + 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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- Definition Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, 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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