Significant Accounting Policies - Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Revenue Arrangement By Type Table [Line Items]
Days past due for income recognition on debt and preferred equity investments to be suspended	90 days
Deferred revenue	$ 134,053	$ 272,248
Unused and Unexpired Tickets
Deferred Revenue Arrangement By Type Table [Line Items]
Deferred revenue	$ 2,600	$ 2,000