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Fair Value - Investments Carried at Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Private fund—real estate |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Expected life of investment |  | 8 years
Expected life of investment, extension increment period | 1 year |
Expected life of investment, extension period threshold | 2 years |
Recurring | Fair Value Measured at Net Asset Value Per Share | Private fund—real estate |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 12,617 |
Unfunded Commitments | 13,658 |
Recurring | Fair Value Measured at Net Asset Value Per Share | Retail Companies—real estate |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | 21,674 |
Unfunded Commitments | $ 0 |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=99392525&loc=SL7495116-110257 + Details
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