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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of COVID-19 (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 03, 2020	Dec. 31, 2019
Prior Credit Facility | COVID-19
Maximum borrowing capacity			$ 241.3
Fourth Amended Credit Facility
Maximum borrowing capacity		$ 270.0
Fourth Amended Credit Facility | COVID-19
Maximum borrowing capacity		270.0
Revolving Credit Facility
Maximum borrowing capacity	$ 75.0	70.0
Remaining available borrowings	$ 70.0
Additional borrowing capacity		75.0
Revolving Credit Facility | COVID-19
Maximum borrowing capacity		70.0
Additional borrowing capacity		75.0
Term Loan Facility
Face amount of debt		200.0
Term Loan Facility | Fourth Amended Credit Facility | COVID-19
Face amount of debt		$ 200.0

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- Definition

Amount of increase in borrowing capacity under the credit facility subject to certain conditions.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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