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Corporate Borrowings - Indebtedness Outstanding Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 41,508 | $ 32,594
Unamortized loan fees | (448) | (580)
Total indebtedness outstanding, net | 41,060 | 32,014
Less current maturities of long-term debt | (401) | (386)
Long-term debt | 40,659 | 31,628
Credit Agreement | Revolver |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 300 | 11,000
Credit Agreement, interest rate | 3.19% |
Senior Notes | Secured Promissory Note |  |
Debt Instrument [Line Items] |  |
Senior secured notes, stated interest rate | 3.71% |
Secured Debt | Secured Promissory Note |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,208 | 1,594
Secured Debt | Note Purchase Agreement Due 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 20,000 | 20,000
Senior secured notes, stated interest rate | 3.53% |
Secured Debt | Note Purchase Agreement Due 2029 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 20,000 | $ 0
Senior secured notes, stated interest rate | 3.80% |

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