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Investments in Unconsolidated Joint Ventures - Balance Sheet Footnotes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Investments in unconsolidated joint ventures: |  |  |  |  |
Mortgage notes payable that could become recourse debt to the Company | $ 33,540 |  | $ 33,540 |  | $ 33,540
Indemnity of guaranteed amount | 16,770 |  | 16,770 |  | 16,770
Amortization of difference between cost of investments and book value of underlying equity | 948 | 3,860 | 3,227 | 9,753 |
Northwestern Mutual Life (NML) |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |
Mortgage notes payable to affiliate | 703,589 |  | 703,589 |  | 712,455
Interest expense on borrowings from related party | $ 9,645 | $ 7,920 | $ 28,992 | $ 21,717 |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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