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Percentage of adjusted EBITDA that guarantor subsidiaries represent

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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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LONG-TERM OBLIGATIONS - Narrative (Details)		12 Months Ended
LONG-TERM OBLIGATIONS - Narrative (Details)	Jun. 29, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 550,000,000
Principal payments of long-term obligations		$ 91,450,000	$ 5,319,000	$ 5,000,000
Consolidated leverage ratio		0.1
Consolidated interest coverage ratio		59.9
Deferred debt issuance cost		$ 2,400,000
Principal amount		$ 10,900,000	90,700,000
Prior Credit Agreement [Member]
Debt Instrument [Line Items]
Principal payments of long-term obligations	127,500,000
Swing Line Loan [Member]
Debt Instrument [Line Items]
Amount of revolving credit facility	25,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Amount of revolving credit facility	60,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
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%
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)		0.50%
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)		1.50%
Promissory Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 1,100,000	700,000
Promissory Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate (percent)		2.90%
Promissory Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate (percent)		7.00%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Principal amount		$ 2,300,000	0
Capital Lease Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate (percent)		5.20%
Capital Lease Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate (percent)		14.30%
100 Million Term Loan [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Principal amount			$ 100,000,000
Weighted Average Interest Rate			3.10%
Maturity date			Aug. 28, 2020
Principal amount		$ 0	$ 90,000,000
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount		$ 550,000,000
Weighted Average Interest Rate		3.80%
Credit facility, maximum additional borrowing capacity	$ 125,000,000
Credit facility, maximum allowable consolidated leverage ratio multiple	0.5
Credit facility maximum allowable consolidated leverage ratio	3.0
Maturity date		Jun. 29, 2023
Remaining availability under the revolving credit facility		$ 508,400,000
Principal amount		7,500,000	$ 0
Five Hundred Fifty Million Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Outstanding letters of credit		$ 34,100,000