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Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 08, 2017
Schedule of Equity Method Investments |  |  |  |  |  |
(Loss) income from equity method investments | $ (1,000,000.0) | $ (4,100,000) | $ 0 | $ (4,116,000) |  |
Distributions received | 0 | 0 | 0 | 0 |  |
Equity method investment | 88,315,000 |  | 88,315,000 |  | $ 88,315,000 |
Unrealized gain (loss) on marketable securities | 2,500,000 | $ (10,000,000.0) | 2,500,000 | $ (26,800,000) |  |
Other Assets |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |
Equity method investment | 88,300,000 |  | 88,300,000 |  | 88,300,000 |
Debt securities | $ 26,400,000 |  | $ 26,400,000 |  | $ 9,900,000 |
CF Real Estate Finance Holdings, L.P. |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |
Equity method investment ownership percentage (in percentage) | 27.00% |  | 27.00% |  |  |
Equity method investment |  |  |  |  |  | $ 100,000,000.0

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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=123874694&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=122636397&loc=SL7495116-110257 + Details
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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=123570139&loc=SL94080555-108585 + Details
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