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Real estate (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Real Estate Properties [Line Items] |  |
Land and land improvements | $ 1,237,888 | $ 1,262,381
Buildings and improvements | 1,934,464 | 1,964,267
Less: accumulated depreciation and amortization | (421,675) | (427,625)
Real estate, net | 2,750,677 | 2,799,023
Real estate available and held for sale | 524,092 | 635,865
Total real estate | 3,274,769 | 3,434,888
Net Lease Assets |  |
Real Estate Properties [Line Items] |  |
Land and land improvements | 336,562 | 344,239
Buildings and improvements | 1,292,675 | 1,295,081
Less: accumulated depreciation and amortization | (326,375) | (315,699)
Real estate, net | 1,302,862 | 1,323,621
Real estate available and held for sale | 8,694 | 0
Total real estate | 1,311,556 | 1,323,621
Operating Properties |  |
Real Estate Properties [Line Items] |  |
Land and land improvements | 132,028 | 132,028
Buildings and improvements | 641,789 | 669,186
Less: accumulated depreciation and amortization | (92,480) | (109,634)
Real estate, net | 681,337 | 691,580
Real estate available and held for sale | 335,571 | 454,587
Total real estate | 1,016,908 | 1,146,167
Land |  |
Real Estate Properties [Line Items] |  |
Land and land improvements | 769,298 | 786,114
Buildings and improvements | 0 | 0
Less: accumulated depreciation and amortization | (2,820) | (2,292)
Real estate, net | 766,478 | 783,822
Real estate available and held for sale | 179,827 | 181,278
Total real estate | $ 946,305 | $ 965,100

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- Definition Real Estate Investment Property, Accumulated Depreciation and Amortization + References No definition available. + Details
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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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