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UNAUDITED CONSOLIDATED STATEMENTS OF CASHFLOWS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents	$ 139,834	$ 217,835	$ 375,067	$ 214,862
Restricted cash and short-term deposits (current portion)	252,843	332,033	276,289	222,265
Long-term restricted cash	152,743	154,393	176,029	175,550
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 545,420	$ 704,261	$ 827,385	$ 612,677

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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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