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ASSET RETIREMENT OBLIGATION (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Asset retirement obligation current	$ 894	$ 708
Collateralized with restricted cash	3,797	$ 3,732
Surety Bonds
Asset retirement obligation current	$ 9,200

X

- Definition

Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

+ References

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