Summary of Significant Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 296,151	$ 252,340	$ 83,310
Restricted cash included in other long-term assets	$ 621		$ 944
Restricted Cash, Statement of Financial Position [Extensible Enumeration]	Other Assets [Member]	Other Assets [Member]	Other Assets [Member]
Total cash, cash equivalents, and restricted cash	$ 296,772	$ 252,340	$ 84,254	$ 79,441