Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 202,197	$ 374,289
Restricted cash	9,199	77,563
Total cash, cash equivalents and restricted cash	211,396	451,852	$ 202,101	$ 119,863
General Corporate Purposes
Cash and cash equivalents	60,192	210,841
Joint Venture
Cash and cash equivalents	$ 142,005	$ 163,448

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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