Supplemental Cash Flow Information (Reconciliation of Cash, Cash Equivalents and Restricted Cash to Statement of Cash Flows) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 113,207	$ 352,867	$ 326,558
Restricted cash	4,019	3,810	5,474
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 117,226	$ 356,677	$ 332,032	$ 108,308