Ratio of adjusted earnings before interest, taxes, depreciation and amortization to cash interest charges

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Credit facility maximum allowable consolidated leverage ratio as defined in the Company's Credit Agreement

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The percentage of the Term Loan that is required as periodic payments including both interest and principal payments

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Letters of Credit, maximum commitment

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Line Of Credit Facility Additional Borrowing Capacity

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Percentage of adjusted EBITDA that guarantor subsidiaries represent

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Proceeds Received From Loan Party Of Subsidiary

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Swing Line Facility included within Revolving Credit Facility

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Ratio of debt to earnings before interest, taxes, depreciation and amortization.

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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, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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 of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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LONG-TERM OBLIGATIONS - Narrative (Details) $ in Thousands			10 Months Ended	11 Months Ended	12 Months Ended			14 Months Ended	36 Months Ended
LONG-TERM OBLIGATIONS - Narrative (Details) $ in Thousands	Feb. 04, 2019 USD ($)	Jun. 29, 2018 USD ($)	Feb. 04, 2024	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2020	Mar. 31, 2023
Debt Instrument [Line Items]
Principal payments of long-term obligations					$ 10,249	$ 5,624	$ 91,450
Consolidated leverage ratio					0.6
Consolidated interest coverage ratio					25.6
Principal amount				$ 245,700	$ 217,700	245,700
Payments of Financing Costs					0	847	$ 2,433
Credit Agreement [Member]
Debt Instrument [Line Items]
Swing Line Facility		$ 25,000
Letters of Credit, maximum commitment		60,000
Finance Leases [Member]
Debt Instrument [Line Items]
Principal amount				3,400	$ 2,600	3,400
Finance Leases [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate (percent)					5.30%
Finance Leases [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate (percent)					5.80%
Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Maturity date	Feb. 04, 2024
Additional interest rate above Federal Fund rate (percent)	0.50%
Additional interest rate above Eurodollar Rate (percent)	1.00%
Percentage of consolidated revenue and adjusted EBITDA that guarantor wholly-owned subsidiaries represent	95.00%
Percentage of adjusted EBITDA that guarantor subsidiaries represent	70.00%
Payments of Financing Costs						$ 800
Amended Credit Agreement [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Proceeds Received From Loan Party Of Subsidiary	$ 5,000
Amended Credit Agreement [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Description of variable rate basis					Fluctuating rate per annum equal to the highest of (a) the federal funds rate plus 0.50% per annum, (b) the prime rate of interest established by the Administrative Agent, and (c) the Eurodollar Rate for an interest period of one month plus 1% per annum.
Basis spread on variable rate (percent)					0.25%
Amended Credit Agreement [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Description of variable rate basis					Rate at which Eurodollar deposits in the London interbank market for an interest period of one, two, three or six months
Basis spread on variable rate (percent)					1.25%
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, face amount					$ 550,000
Weighted Average Interest Rate					2.20%	4.00%
Maturity date					Feb. 04, 2024
Remaining availability under the revolving credit facility					$ 470,200
Principal amount				$ 70,000	51,000	$ 70,000
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Outstanding letters of credit					28,800
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, face amount		550,000
Credit facility, maximum additional borrowing capacity		$ 125,000
Credit facility, maximum allowable consolidated leverage ratio multiple		0.5
Credit facility maximum allowable consolidated leverage ratio		3.0
Maturity date		Jun. 29, 2023
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	725,000
Debt Instrument, face amount	550,000
One Hundred Seventy Five Million Term Loan Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, face amount					$ 175,000
Weighted Average Interest Rate				3.80%	2.20%
Maturity date					Feb. 04, 2024
Principal amount				$ 171,700	$ 164,100	$ 171,700
One Hundred Seventy Five Million Term Loan Facility [Member] \| Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, face amount	$ 175,000
Debt Instrument Periodic Payment Percentage								0.625%
One Hundred Seventy Five Million Term Loan Facility [Member] \| Amended Credit Agreement [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument Periodic Payment Percentage			1.875%						1.25%