Summary of Significant Accounting Policies (Components of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 193,411	$ 258,421	$ 299,856
Restricted cash and cash equivalents included in other assets	1,438	554	552
Cash, cash equivalents and restricted cash of discontinued operations	0	106,702	79,068
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$ 194,849	$ 365,677	$ 379,476