Financial Instruments -Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Cost or Amortized Cost
Cash and cash equivalents, at carrying value	$ 359,724	$ 591,003	$ 562,714
Restricted cash	43,992	127,278	74,532
Short-term investments	110,316	33,737
Cash, Cash Equivalents, and Restricted Cash
Total cash, cash equivalents, and restricted cash	403,716	718,281	$ 637,246	$ 945,820
Short-term Investments
Short-term Investments	110,316	33,737
Fair Value, Measurements, Recurring
Cost or Amortized Cost
Restricted cash	43,992	127,278
Short-term investments	110,316	33,737
Cash, cash equivalents, and available-for-sale debt securities, amortized cost	556,718	802,430
Unrealized Gains
Unrealized Gains	29	4,620
Unrealized Losses	(1,038)	(204)
Estimated Fair Value
Cash equivalents	294,396	509,971
Cash, cash equivalents, and available-for-sale debt securities	555,709	806,846
Cash, Cash Equivalents, and Restricted Cash
Total cash, cash equivalents, and restricted cash	403,716	718,281
Short-term Investments
Short-term Investments	110,316	33,737
Long-term Investments
Long-term Investments	41,677	54,828
U.S. treasury securities | Fair Value, Measurements, Recurring
Cost or Amortized Cost
Short-term investments	87,313	16,718
Debt securities, available-for-sale, amortized cost	130,002	71,749
Unrealized Gains
Unrealized Gains	26	1
Unrealized Losses	(1,038)	(204)
Estimated Fair Value
Debt securities, available for sale, estimated fair value	128,990	71,546
Short-term Investments
Short-term Investments	87,313	16,718
Long-term Investments
Long-term Investments	41,677	54,828
Agency bonds | Fair Value, Measurements, Recurring
Cost or Amortized Cost
Short-term investments	23,003	11,906
Debt securities, available-for-sale, amortized cost	23,000	11,900
Unrealized Gains
Unrealized Gains	3	6
Unrealized Losses	0	0
Estimated Fair Value
Debt securities, available for sale, estimated fair value	23,003	11,906
Cash, Cash Equivalents, and Restricted Cash
Total cash, cash equivalents, and restricted cash	0
Short-term Investments
Short-term Investments	23,003	11,906
Long-term Investments
Long-term Investments	0	0
Equity securities
Cost or Amortized Cost
Short-term investments		5,113
Debt securities, available-for-sale, amortized cost		500
Unrealized Gains
Unrealized Gains		4,613
Unrealized Losses		0
Estimated Fair Value
Debt securities, available for sale, estimated fair value		5,113
Short-term Investments
Short-term Investments		5,113
Equity securities | Fair Value, Measurements, Recurring
Cost or Amortized Cost
Short-term investments		5,113
Short-term Investments
Short-term Investments		5,113
Long-term Investments
Long-term Investments		0
Cash | Fair Value, Measurements, Recurring
Cost or Amortized Cost
Cash and cash equivalents, at carrying value	65,328	81,032
Estimated Fair Value
Cash equivalents	65,328	81,032
Cash, Cash Equivalents, and Restricted Cash
Total cash, cash equivalents, and restricted cash	65,328	81,032
Money markets funds | Fair Value, Measurements, Recurring
Cost or Amortized Cost
Cash and cash equivalents, at carrying value	294,396	509,971
Estimated Fair Value
Cash equivalents	294,396	509,971
Cash, Cash Equivalents, and Restricted Cash
Total cash, cash equivalents, and restricted cash	$ 294,396	$ 509,971