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DEBT - Revolving Credit (Details)		3 Months Ended
	Dec. 21, 2018 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.0
Long-term debt, gross		$ 505,228,000		$ 460,228,000
Interest expense		6,272,000	$ 7,090,000
Liquidity position to meet future obligations, amount		277,200,000		$ 308,100,000
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%
Line of credit facility, excess availability, commitment percentage, threshold	10.00%
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%
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross		45,000,000
Interest expense		$ 100,000	$ 0
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Bridge Loan
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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit 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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The amount of liquidity position to meet the future obligations for the entity.

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