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Operating revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]    
Contract assets $ 258 $ 309
Deferred revenue and customer advances 3,195 4,590
Deferred revenue included in other long-term liabilities $ 294 $ 432