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Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	$ 11,559		$ 347
Minimum protective endowment held in an interest-bearing account	500		500
Restricted cash
Cash and cash equivalents	274,774	$ 187,509	717,804
Restricted cash included in other current assets	11,559		347
Restricted cash included in other assets	500		500
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	286,833	202,020	$ 718,651	$ 420,497
United States
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	1,700	100
Restricted cash
Restricted cash included in other current assets	1,700	100
Australia and New Zealand
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash included in other current assets	9,900	13,900
Restricted cash
Restricted cash included in other current assets	$ 9,900	$ 13,900

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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, classified as current. 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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