Fair Values of Assets and Liabilities - Recurring Measurements (Details) | 6 Months Ended | |
Jun. 30, 2021USD ($)security | Jun. 30, 2020USD ($) | Dec. 31, 2020USD ($) |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash equivalents | $ 26,593,000 | | $ 26,291,000 |
Total equity investments | 12,835,000 | | 12,439,000 |
Total debt investments | 10,554,000 | | 12,310,000 |
Total investments | 23,389,000 | | 24,749,000 |
Total | 49,982,000 | | 51,040,000 |
Restricted cash equivalents | 22,536,000 | | 22,837,000 |
Cash | 95,213,000 | | 80,897,000 |
Restricted cash | 2,405,000 | | 2,409,000 |
Gross proceeds from sale of equity securities | 741,000 | $ 2,888,000 | |
Gross realized gains recorded on sale of equity securities | 175,000 | 296,000 | |
Gross realized losses recorded on sale of equity securities | 0 | 214,000 | |
Amortized cost of available for sale debt securities | 10,066,000 | | 11,554,000 |
Unrealized gains on available for sale debt securities | 488,000 | | 756,000 |
Unrealized losses on available for sale debt securities | $ 18,000 | | 4,000 |
Debt investments fair value | security | 3,000 | | |
Debt Securities unrealized loss position, less than 12 months | $ 512,000 | | |
Gross proceeds from sale of available for sale debt securities | 1,294,000 | 1,963,000 | |
Gross realized gains recorded on sale of debt securities | 18,000 | 13,000 | |
Gross realized losses recorded on sale of debt securities | 0 | $ 0 | |
Mortgage note payable | 6,579,000 | | 6,783,000 |
Carrying Value | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Mortgage note payable | 6,980,000 | | 7,171,000 |
Estimated Fair Value | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Mortgage note payable | 7,901,000 | | 8,177,000 |
High yield fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 3,226,000 | | 3,156,000 |
International bond fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 2,808,000 | | 2,818,000 |
Financial services industry | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 1,401,000 | | 1,348,000 |
Healthcare | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 536,000 | | 477,000 |
Technology | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 861,000 | | 765,000 |
Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 4,003,000 | | 3,875,000 |
Industrial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 530,000 | | 540,000 |
Technology bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,267,000 | | 1,471,000 |
Government bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 5,823,000 | | 7,301,000 |
Energy bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 477,000 | | 484,000 |
Financial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,335,000 | | 1,359,000 |
Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,122,000 | | 1,155,000 |
Restricted debt securities | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 6,922,000 | | 8,395,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash equivalents | 26,593,000 | | 26,291,000 |
Total equity investments | 6,801,000 | | 6,465,000 |
Total debt investments | 5,823,000 | | 7,301,000 |
Total investments | 12,624,000 | | 13,766,000 |
Total | 39,217,000 | | 40,057,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | High yield fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International bond fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial services industry | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 1,401,000 | | 1,348,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Healthcare | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 536,000 | | 477,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Technology | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 861,000 | | 765,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 4,003,000 | | 3,875,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Industrial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Technology bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 5,823,000 | | 7,301,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Energy bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Financial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash equivalents | 0 | | 0 |
Total equity investments | 6,034,000 | | 5,974,000 |
Total debt investments | 4,731,000 | | 5,009,000 |
Total investments | 10,765,000 | | 10,983,000 |
Total | 10,765,000 | | 10,983,000 |
Significant Other Observable Inputs (Level 2) | High yield fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 3,226,000 | | 3,156,000 |
Significant Other Observable Inputs (Level 2) | International bond fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 2,808,000 | | 2,818,000 |
Significant Other Observable Inputs (Level 2) | Financial services industry | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | Healthcare | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | Technology | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | Industrial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 530,000 | | 540,000 |
Significant Other Observable Inputs (Level 2) | Technology bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,267,000 | | 1,471,000 |
Significant Other Observable Inputs (Level 2) | Government bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Other Observable Inputs (Level 2) | Energy bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 477,000 | | 484,000 |
Significant Other Observable Inputs (Level 2) | Financial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,335,000 | | 1,359,000 |
Significant Other Observable Inputs (Level 2) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 1,122,000 | | 1,155,000 |
Significant Unobservable Inputs (Level 3) | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Cash equivalents | 0 | | 0 |
Total equity investments | 0 | | 0 |
Total debt investments | 0 | | 0 |
Total investments | 0 | | 0 |
Total | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | High yield fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | International bond fund | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Financial services industry | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Healthcare | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Technology | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total equity investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Industrial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Technology bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Government bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Energy bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Financial bonds | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | 0 | | 0 |
Significant Unobservable Inputs (Level 3) | Other | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Total debt investments | $ 0 | | $ 0 |