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Represents the additional borrowing capacity on the entity's credit agreement if specific terms and conditions are met.

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

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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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Amount of long-term debt and lease obligation, classified as noncurrent.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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LONG-TERM DEBT (Details) $ in Thousands			1 Months Ended			3 Months Ended			6 Months Ended		12 Months Ended
LONG-TERM DEBT (Details) $ in Thousands	Dec. 21, 2016	Jun. 08, 2015 USD ($)	Dec. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2020	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt
Total long-term debt and finance leases									$ 2,229,645		$ 2,286,130
Less: current portion of long-term debt and finance leases									(24,889)		(27,301)
Total long-term debt									2,198,003		2,250,677
Less: deferred debt issuance costs									$ (6,753)		(8,152)
Leverage ratio				3.00					4.22
Deferred debt issuance costs									$ 6,753		8,152
Dividend declared								$ 27,932
Interest coverage ratio									3.84
Repayments of senior notes									$ 4,208	$ 4,294
Gain on extinguishment of debt							$ 249		$ 234	249
Minimum
Debt
Interest coverage ratio									2.25
Maximum
Debt
Leverage ratio for an event of default									5.25
Senior Notes 6.50 Percent Due 2022
Debt
Total long-term debt and finance leases									$ 438,856		443,002
Unamortized discount									$ 1,653		$ 1,998
Aggregate principal amount		$ 300,000			$ 200,000
Interest rate (as a percent)		6.50%			6.50%				6.50%		6.50%
Issue price as a percentage of par		98.26%
Yield to maturity (as a percent)		6.80%
Gross proceeds		$ 294,800			$ 200,000
Repayments of senior notes									$ 4,500	$ 4,600
Senior Secured Credit Facility
Debt
Amounts outstanding									$ 0
Senior Secured Credit Facility \| Weighted average
Debt
Weighted average interest rate (as a percent)									4.00%		4.80%
Term Loan
Debt
Total long-term debt and finance leases									$ 1,770,644		$ 1,779,109
Unamortized discount				$ 2,300					4,893		5,604
Aggregate principal amount				$ 900,000
Quarterly principal payments required									$ 2,250
Issue discount (as a percentage)				0.25%
Term Loan \| LIBOR
Debt
Margin (as a percent)									3.00%
Term Loan \| LIBOR \| Minimum
Debt
Margin (as a percent)									1.00%
Senior secured credit facility - revolving loan
Debt
Total long-term debt and finance leases											40,000
Maximum borrowing capacity of credit facility				$ 110,000
Amounts outstanding											40,000
Stand-by letter of credit outstanding									$ 18,600
Available borrowing capacity									$ 91,400
Senior secured credit facility - revolving loan \| LIBOR
Debt
Amounts outstanding											30,000
Senior secured credit facility - revolving loan \| LIBOR \| Minimum
Debt
Margin (as a percent)									2.50%
Senior secured credit facility - revolving loan \| LIBOR \| Maximum
Debt
Margin (as a percent)									3.25%
Senior secured credit facility - revolving loan \| LIBOR \| Weighted average \| Forecast
Debt
Margin (as a percent)						3.00%
Senior secured credit facility - revolving loan \| Alternate base rate
Debt
Amounts outstanding											10,000
Senior secured credit facility - revolving loan \| Alternate base rate \| Minimum
Debt
Margin (as a percent)									1.50%
Senior secured credit facility - revolving loan \| Alternate base rate \| Maximum
Debt
Margin (as a percent)									2.25%
Senior secured credit facility - revolving loan \| Alternate base rate \| Weighted average \| Forecast
Debt
Margin (as a percent)						2.00%
Finance leases
Debt
Total long-term debt and finance leases									$ 20,145		$ 24,019
Incremental Term Loan Facility
Debt
Aggregate principal amount				935,000
Quarterly principal payments required			$ 2,340
Issue discount (as a percentage)	0.50%
Incremental Term Loan Facility \| Maximum
Debt
Additional borrowing capacity				$ 300,000