States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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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 the debt instrument was issued, in CCYY-MM-DD format.

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

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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DEBT (Long-Term Debt) (Details) - USD ($) $ in Thousands	1 Months Ended		6 Months Ended
DEBT (Long-Term Debt) (Details) - USD ($) $ in Thousands	Oct. 31, 2016	Apr. 30, 2015	Jun. 30, 2021	Dec. 31, 2020	Oct. 20, 2016	Apr. 01, 2015
Debt Instrument [Line Items]
Fair value of long-term debt			$ 776,643	$ 793,591
Carrying value of long-term debt			$ 718,785	$ 715,567
Senior Notes 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 350,000
Debt Instrument, Issuance Date	Oct. 20, 2016
Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			3.30%
Debt Instrument, Covenant Compliance			As of June 30, 2021, the Company was in compliance with all of its debt covenants
Weighted Average [Member]
Debt Instrument [Line Items]
Debt Instrument, Term			12 years 10 months 24 days
Senior Notes 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 350,000
Debt Instrument, Issuance Date		Apr. 01, 2015
Minimum \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 50,000
Debt Instrument, Maturity Date			Aug. 20, 2025
Debt Instrument, Interest Rate, Stated Percentage			2.75%
Maximum \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000
Debt Instrument, Maturity Date			Apr. 01, 2045
Debt Instrument, Interest Rate, Stated Percentage			4.02%