Overview and Summary Of Significant Accounting Policies Schedule of cash, restricted cash and cash equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 20,629	$ 20,502
Restricted Cash and Cash Equivalents	5	6,120
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 20,634	$ 26,622	$ 53,251	$ 48,552