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Corporate Borrowings - Indebtedness Outstanding (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 40,000 | $ 40,000
Less unamortized loan fees | (124) | (129)
Total indebtedness outstanding, net | 39,876 | 39,871
Less current maturities of long-term debt | (2,400) | (1,600)
Long-term debt and Credit Agreement - Revolver | 37,476 | 38,271
Credit Agreement - Revolver, 1.12% (variable rate) due 2025 | Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 0 | 0
Credit agreement, interest rate (as a percent) | 1.12% |
Prudential Note Purchase Agreement, 3.53% (fixed rate) due 2027 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 20,000 | 20,000
Senior secured notes, stated interest rate (as a percent) | 3.53% |
Prudential Note Purchase Agreement, 3.80% (fixed rate) due 2029 | Secured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 20,000 | $ 20,000
Senior secured notes, stated interest rate (as a percent) | 3.80% |

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