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CASH AND CASH EQUIVALENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
CASH AND CASH EQUIVALENTS
Short-term investments	$ 579,829	$ 183,189
Reserve requirement, included in cash and equivalents	18,300	18,000
Short-term investments pledged as collateral
CASH AND CASH EQUIVALENTS
Short-term investments	$ 96,300	$ 25,400

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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.

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