LONG-TERM DEBT LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Nov. 17, 2017
Debt Instrument [Line Items]
Senior unsecured notes	$ 413,551	$ 414,158
Total	1,708,502	1,889,240
Current amount of long-term debt	0	0
Total long-term debt	1,692,258	1,872,203
Outstanding standby letter of credit	5,862	5,862
Stated interest rate percentage, senior unsecured debt			7.25%
Capital Lease Obligations
Debt Instrument [Line Items]
Other	889	912
Total Credit Facility [Member]
Debt Instrument [Line Items]
New Credit Facility	1,294,062	1,474,170
Deferred Financing Costs [Member]
Debt Instrument [Line Items]
Total	(16,244)	(17,037)
Term B Loan, due November 17, 2024 [Member]
Debt Instrument [Line Items]
New Credit Facility	1,291,700	1,291,700
Unamortized Premium on Debt	2,362	2,470
Senior Notes due October 17, 2024 [Member]
Debt Instrument [Line Items]
Senior unsecured notes	400,000	400,000
Unamortized Premium on Debt	13,551	14,158
RevolverDueNovember172022Member [Member]
Debt Instrument [Line Items]
New Credit Facility	$ 0	$ 180,000

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

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Amount, after accumulated amortization, of debt premium.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt classified as other.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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