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Supplemental cash flow information (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental cash flow information
Cash and cash equivalents	$ 326,113	$ 278,766	$ 359,671
Restricted cash - Current	102,875	28,129	60,585
Restricted cash - Non-current	933,464
Cash, cash equivalents, and restricted cash	$ 1,362,452	$ 306,895	$ 420,256	$ 305,567

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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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