Supplemental Cash Flow Information (Reconciliation of Cash, Cash Equivalents and Restricted Cash to Statement of Cash Flows) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 183,377	$ 352,867	$ 281,849
Restricted cash	4,239	3,810	5,434
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 187,616	$ 356,677	$ 287,283	$ 108,308