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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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Line Of Credit Facility, Contingent Increase In Borrowing Capacity

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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.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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