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CREDIT FACILITY AND ACQUISITION DEBT Credit Facility (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	May 13, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Credit Facility amortization of debt issuance costs			$ 459	$ 592
Ratio Actual [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)			0.25
Credit Agreement 2018 [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility amortization of debt issuance costs	$ 80	$ 118	$ 297	$ 363
Long-term Debt			86,900			$ 47,200
Line of Credit [Member] | Revolving Credit Facility, Secured, Floating Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt			86,900
Remaining borrowing capacity			$ 60,800		$ 21,400

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Indebtedness divided by net capital.

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