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Fair Value Measurements (Fair Value Assets Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Assets measured at fair value on a recurring basis    
Beginning Balance $ 56 $ 42
Change in Fair Value 0 0
Ending Balance $ 56 $ 42