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Represents the issue price of debt instrument as a percentage of par.

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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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Amount of short-term and long-term debt and lease obligation.

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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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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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Fair value amount of debt instrument that was repurchased.

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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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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, 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, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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LONG-TERM DEBT (Details) $ in Thousands			1 Months Ended		3 Months Ended				12 Months Ended
LONG-TERM DEBT (Details) $ in Thousands	Jul. 03, 2017 USD ($)	Jun. 08, 2015 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2020	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt
Total long-term debt						$ 2,262,111			$ 2,262,111
Total long-term debt						2,262,111			2,262,111	$ 2,315,077
Less: current portion of long-term debt						(18,350)			(18,350)	(18,350)
Less: deferred debt issuance costs						(8,152)			(8,152)	(11,386)
Total long-term debt						2,235,609			2,235,609	2,285,341
Unamortized discount						$ 7,602			$ 7,602
Leverage ratio			3.00			4.38			4.38
Deferred debt issuance costs						$ 8,152			$ 8,152	11,386
Dividend declared									$ 27,865	110,383	$ 101,951
Interest coverage ratio						3.69			3.69
Repayments of senior notes									$ 49,804
Gain (loss) on extinguishment of debt									$ 4,510
Minimum
Debt
Interest coverage ratio						2.25			2.25
Maximum
Debt
Leverage ratio for an event of default						5.25			5.25
Senior Notes 6.50 Percent Due 2022
Debt
Total long-term debt						$ 443,002			$ 443,002	497,009
Unamortized discount						$ 1,998			$ 1,998	$ 2,991
Aggregate principal amount		$ 300,000		$ 200,000
Interest rate (as a percent)		6.50%		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
Repurchase amount of the aggregate principal						$ 55,000			$ 55,000
Senior Secured Credit Facility \| Weighted average
Debt
Weighted average interest rate (as a percent)									4.80%	5.54%
Term Loan
Debt
Total long-term debt						1,779,109			$ 1,779,109	$ 1,796,068
Unamortized discount			$ 2,300			$ 5,604			5,604	6,994
Aggregate principal amount			$ 900,000
Quarterly principal payments required									$ 2,250
Issue discount (as a percentage)			0.25%
Term Loan \| LIBOR
Debt
Interest rate (as a percent)						3.00%			3.00%
Term Loan \| LIBOR \| Minimum
Debt
Margin (as a percent)									1.00%
Senior secured credit facility - revolving loan
Debt
Total long-term debt						$ 40,000			$ 40,000	22,000
Maximum borrowing capacity of credit facility			$ 110,000
Amounts outstanding						40,000			40,000	22,000
Stand-by letter of credit outstanding						17,100			17,100
Available borrowing capacity						52,900			52,900
Senior secured credit facility - revolving loan \| LIBOR
Debt
Amounts outstanding						30,000			$ 30,000	10,000
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			$ 10,000	$ 12,000
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%
Senior Notes
Debt
Gain (loss) on extinguishment of debt						$ 3,100	$ 1,100	$ 300
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