Supplemental Cash Flow Information (Reconciliation of Cash, Cash Equivalents and Restricted Cash to Statement of Cash Flows) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 75,667	$ 59,133	$ 129,468
Restricted cash	11,029	29,486	8,845
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 86,696	$ 88,619	$ 138,313	$ 356,677