Supplemental Cash Flow Information (Reconciliation of Cash, Cash Equivalents and Restricted Cash to Statement of Cash Flows) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 352,867	$ 102,580
Restricted cash	3,810	5,728
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 356,677	$ 108,308	$ 54,948