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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

X

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

+ References

No definition available.

+ Details

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- Definition

Real Estate Investment Property, Accumulated Depreciation and Amortization

+ References

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- Definition

Real Estate Investment Property, Held for Use, Net

+ References

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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

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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

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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

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