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Corporate Borrowings - Narrative (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018 | Aug. 23, 2017
Debt Instrument [Line Items] |  |  |  |  |
Unamortized loan fees |  | $ 448,000 |  | $ 580,000 |
Long-term debt, gross |  | 41,508,000 |  | 32,594,000 |
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New loan fees on credit agreement |  | 0 |  |  |
Unamortized loan fees |  | 299,000 |  |  |
Note Purchase Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized loan fees |  | 149,000 |  |  |
Secured Debt | Note Purchase Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New loan fees on credit agreement |  | 0 |  |  |
Term loan face amount |  | 75,000,000 |  |  |
Secured Debt | Note Purchase Agreement Due 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | $ 20,000,000 |  | 20,000,000 |
Proceeds from issuance of debt |  |  | $ 20,000,000 |  |
Senior secured notes, stated interest rate |  | 3.53% |  |  |
Secured Debt | Note Purchase Agreement Due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | $ 20,000,000 |  | 0 |
Proceeds from issuance of debt | $ 20,000,000 |  |  |  |
Senior secured notes, stated interest rate |  | 3.80% |  |  |
Revolver | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross |  | $ 300,000 |  | $ 11,000,000 |
Remaining borrowing capacity |  | $ 149,700,000 |  |  |
Credit Agreement, interest rate |  | 3.19% |  |  |
Revolver | Credit Agreement | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 150,000,000
Contingent increase in borrowing capacity |  |  |  |  | $ 25,000,000

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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