Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Restricted Cash and Cash Equivalents	$ 16,700	$ 17,300
Restricted Cash included in other current assets	932	1,100	$ 1,097
Restricted Cash included in other assets	$ 15,753	$ 16,200	$ 16,145