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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
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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Investments, Debt and Equity Securities

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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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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