Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 268,918	$ 187,509
Restricted cash included in other current assets	9,794	14,011
Restricted cash included in other assets	500	500
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 279,212	$ 202,020	$ 420,497	$ 312,237