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Investments - Debt Securities Available-for-sale, Unrealized Loss Position, Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | $ 261,926 | $ 230,408
Investment in debt securities - Gross unrealized loss | (6,872) | (366)
Investments at fair value | 257,990 | 231,685
Debt Securities due April 2058 |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | 6,498 | 6,855
Investment in debt securities - Gross unrealized loss | (31) | (9)
Investments at fair value | 6,467 | 6,846
Debt securities due February 2057 |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | 5,624 | 7,324
Investment in debt securities - Gross unrealized loss | (6) | (1)
Investments at fair value | 5,618 | 7,323
Debt securities due September 2059 |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | 63,693 | 37,843
Investment in debt securities - Gross unrealized loss | (2,802) | (356)
Investments at fair value | 60,891 | 37,487
Total Basis |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in beneficial interests - Basis | 142,701 | 52,022
Total Gross unrealized losses |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in beneficial interests - Gross unrealized loss | (6,872) | (366)
Total Carrying value (fair value) |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in beneficial interests | 135,829 | $ 51,656
Debt securities due November 2059 |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | 17,367 |
Investment in debt securities - Gross unrealized loss | (346) |
Investments at fair value | 17,021 |
Debt securities due December 2059 |  |
Investments, Debt and Equity Securities [Line Items] |  |
Investment in debt securities - Basis | 49,519 |
Investment in debt securities - Gross unrealized loss | (3,687) |
Investments at fair value | $ 45,832 |

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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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