FINANCIAL ASSETS AND LIABILITIES - Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	$ 153,093	$ 153,060
Restricted cash	22,009	10,185
Marketable securities	3,684	13,861
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets
Related party shareholder loans	6,228	10,700
Derivative assets	572	3,876
Liabilities
Derivative liabilities	27,692	10,455
Estimate of Fair Value Measurement [Member] \| Secured Debt [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities
Long-term debt	1,054,022	1,122,148
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets
Cash and cash equivalents	153,093	153,060
Restricted cash	22,009	10,185
Marketable securities	3,684	13,861
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets
Related party shareholder loans	6,228	10,700
Derivative assets	572	3,876
Liabilities
Derivative liabilities	27,692	10,455
Reported Value Measurement [Member] \| Secured Debt [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities
Long-term debt	$ 1,054,022	$ 1,122,148

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This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item includes restricted cash and investments which are restricted as to withdrawal or usage.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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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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