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Fair Value Measurements Fair Value Level 3 Rollforward (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Government and government sponsored entities [Member] | Dec. 31, 2012 Government and government sponsored entities [Member] | Sep. 30, 2013 Cost-method Investments [Member] | Dec. 31, 2012 Cost-method Investments [Member] | Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] Government and government sponsored entities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Government and government sponsored entities [Member] | Sep. 30, 2013 Citadel Mall [Member] | Jun. 30, 2013 Citadel Mall [Member] | Dec. 31, 2012 Citadel Mall [Member] | Jun. 30, 2013 Citadel Mall [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investments, Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,765 |  | $ 45,178 |
Begninning balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,475 | 2,475 | 11,123 | 11,829 |  |  |  |
Redemption of TIF bonds |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | (11,002) |  |  |  |  |
Net settlement |  |  |  |  |  |  |  |  | 0 |  |  |  |  | (4,875) |  |  |  |  |  |  |
Reclassification adjustment AOCI |  |  |  |  |  |  |  |  |  | 0 |  | (1,542) |  |  |  |  |  |  |  |  |
Transfer out of Level 3 |  |  |  |  |  |  |  |  |  | (121) | [1] | (2,248) | [1] |  |  |  |  |  |  |  |
Realized gain recorded in earnings |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 2,400 |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,475 | 0 | 11,829 |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 266 |  |  |
Capital expenditures | 81,039 | [2] | 78,728 | [2] | 277,646 | [2] | 232,772 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | (1,226) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment of real estate | 0 |  | (3,912) |  | (21,038) |  | (3,912) |  |  |  |  |  |  |  | (2,400) |  |  | (20,453) |  |  |
Fair Value of Investments In Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,900 |  | $ 23,900
[1] | (1)The TIF bonds were adjusted to their net realizable value as of December 31, 2012 and were redeemed in January 2013. The difference in estimate was recorded as a transfer to real estate assets.
[2] | (3) Amounts include acquisitions of real estate assets and investments in unconsolidated affiliates. Developments in progress are included in the All Other category.

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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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