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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of COVID-19 (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Sep. 03, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jul. 20, 2016
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Prior Credit Facility |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 250.0
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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