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FINANCIAL INSTRUMENTS - Estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liabilities:
Derivative instruments payable	$ 10,000	$ 19,300
Fair value, measurements, recurring
Assets:
Cash and cash equivalents	140,361	174,721
Restricted cash	1,140	14,928
Marketable securities	2,673	2,639
Derivative instruments receivable	4,557
Liabilities:
Floating rate debt	2,075,867	2,089,930
Fixed rate debt	160,141	65,348
Derivative instruments payable	9,972	19,261
Fair value, measurements, recurring | Collateral Pledged
Assets:
Marketable securities		5,835
Fair Value, Inputs, Level 1 | Fair value, measurements, recurring
Assets:
Cash and cash equivalents	140,361	174,721
Restricted cash	1,140	14,928
Marketable securities	2,673	2,639
Derivative instruments receivable	0
Liabilities:
Floating rate debt	0	0
Fixed rate debt	0	0
Derivative instruments payable	0	0
Fair Value, Inputs, Level 1 | Fair value, measurements, recurring | Collateral Pledged
Assets:
Marketable securities		5,835
Fair Value, Inputs, Level 2 | Fair value, measurements, recurring
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Marketable securities	0	0
Derivative instruments receivable	4,557
Liabilities:
Floating rate debt	2,075,867	2,089,930
Fixed rate debt	0	6,251
Derivative instruments payable	9,972	19,261
Fair Value, Inputs, Level 2 | Fair value, measurements, recurring | Collateral Pledged
Assets:
Marketable securities		0
Fair Value, Inputs, Level 3 | Fair value, measurements, recurring
Assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Marketable securities	0	0
Derivative instruments receivable	0
Liabilities:
Floating rate debt	0	0
Fixed rate debt	160,141	59,097
Derivative instruments payable	$ 0	0
Fair Value, Inputs, Level 3 | Fair value, measurements, recurring | Collateral Pledged
Assets:
Marketable securities		$ 0

X

- Definition

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

Total US Dollar fixed rate debt

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Total US Dollar floating rate debt

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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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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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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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