Financial Instruments - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	[1]	$ 235,638	$ 396,035
Restricted cash		178,541	219,079
Cash, cash equivalents and restricted cash		414,179	615,114	$ 400,528	$ 416,710
Cash
Debt Securities, Available-for-sale [Line Items]
Cash, cash equivalents and restricted cash		241,700	318,080
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash, cash equivalents and restricted cash		$ 172,479	$ 297,034

[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the condensed consolidated balance sheets (see Note 11 - Portfolio Financings).