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Accounts Receivable (Schedule of Contract Receivables) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Noncurrent receivables $ 33,681,000 $ 36,539,000
Allowance for expected credit losses (210,000) (274,000)
Noncurrent receivables, net $ 33,471,000 $ 36,265,000