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DEBT - Revolving Credit Agreement (Details)		3 Months Ended			6 Months Ended
	Dec. 21, 2018 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross		$ 423,835,000			$ 423,835,000		$ 453,835,000
Interest expense		6,034,000	$ 5,882,000		12,184,000	$ 12,154,000
Repayments of lines of credit					232,000	45,449,000
Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 175,000,000
Line of credit facility accordion feature increase limit	$ 275,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.20%
Fixed charge coverage ratio	1.0
Line of credit facility, excess availability, commitment percentage, threshold	10.00%
Long-term debt, gross		0	0		0	0
Interest expense		0	200,000		0	$ 200,000
Proceeds from issuance of long-term debt				$ 45,000,000.0
Repayments of lines of credit			$ 45,000,000.0
Liquidity position to meet future obligations, amount		$ 304,300,000			$ 304,300,000		$ 384,000,000.0
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Revolving Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Revolving Credit Agreement | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.25%
Revolving Credit Agreement | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Letter of Credit | Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Bridge Loan | Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 17,500,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the cost of borrowed funds accounted for as interest expense.

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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.

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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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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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