LONG-TERM DEBT, LETTERS OF CREDIT AND DERIVATIVES - Credit Facility Narrative (Details)		3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 17, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2019 USD ($)	Aug. 30, 2019 USD ($)
Debt Instrument [Line Items]
Percentage of equity interests of material first-tier foreign subsidiaries guaranteed to the line of credit facility			65.00%	65.00%
Senior secured leverage ratio			3.50	3.50
Minimum consolidated EBITDA			$ 6,500,000
Commitment fee percentage				0.55%
Cash and cash equivalents			15,550,000	$ 15,550,000				$ 12,175,000
Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.35%
Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.55%
Subsequent Event
Debt Instrument [Line Items]
Senior secured leverage ratio		2.75			3.25		2.50
Net leverage ratio						4.50	5.50
Debt service coverage ratio		1.25			1.00
Minimum consolidated EBITDA		$ 50,500,000			$ 18,500,000
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate, floor	0.0100
Basis spread on variable rate				4.25%
LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	4.25%
Total Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs and debt discount			$ 3,200,000	$ 3,200,000
Senior Secured [Member]
Debt Instrument [Line Items]
Net leverage ratio			2.51	2.51
Line of Credit
Debt Instrument [Line Items]
Available borrowing capacity			$ 53,000,000	$ 53,000,000
Credit Facility revolver
Debt Instrument [Line Items]
Borrowing capacity	$ 200,000,000								$ 225,000,000
Standby Letters of Credit
Debt Instrument [Line Items]
Outstanding letters of credit			$ 17,700,000	$ 17,700,000				$ 20,500,000