Description of Business and Summary of Significant Accounting Policies (Cash, Cash Equivalents, and Restricted Cash Shown in the Statement of Cash Flows) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 88,023	$ 73,228	$ 107,698
Restricted cash	7,902	35,051	18,240
Restricted cash included in other long-term assets	6,073		6,566
Total cash, cash equivalents, and restricted cash shown in the Condensed Consolidated Statement of Cash Flows	$ 101,998	$ 111,369	$ 132,504	$ 149,681