Statements of Cash Flows (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 208,892	$ 304,962
Restricted cash	50,000	0
Total cash, cash equivalents and restricted cash shown on the statements of cash flows	$ 258,892	$ 304,962	$ 167,058	$ 36,973