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Investments - Available-for-sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Investment in debt securities - Basis | $ 261,926 | $ 230,408
Investment in debt securities - Gross unrealized gains | 2,936 | 1,643
Investment in debt securities - Gross unrealized loss | (6,872) | (366)
Investment in debt securities | 257,990 | 231,685
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment in beneficial interests - Basis | 331,802 | 288,362
Investment in beneficial interests - Gross unrealized gains | 2,936 | 1,643
Investment in beneficial interests - Gross unrealized loss | (6,872) | (366)
Investment in beneficial interests | 327,866 | 289,639
Beneficial interests |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment in beneficial interests - Basis | 69,876 | 57,954
Investment in beneficial interests - Gross unrealized gains | 0 | 0
Investment in beneficial interests - Gross unrealized loss | 0 | 0
Investment in beneficial interests | $ 69,876 | $ 57,954

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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