UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Supplemental - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Supplemental disclosures:
Cash and cash equivalents	$ 263,414	$ 386,367
Restricted cash (Note 1)	1,910	2,071
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	265,324	388,438
Cash paid for income taxes, net of refunds	20,936	334
Non-cash transactions
Property and equipment purchases in accounts payable and accrued liabilities	1,130	$ 888
Receivables from options exercised	$ 15,165