8. Fair Value Measurements (Details) - Balance Sheet Grouping - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Accounts receivable unbilled, net - noncurrent	$ 11,488	$ 20,840
Accounts receivable trade, net - noncurrent	9,645	21,293
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including current maturities	266,169
Carrying Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Accounts receivable unbilled, net - noncurrent	11,488	20,840
Accounts receivable trade, net - noncurrent	9,645	21,293
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including current maturities	266,169	246,737
Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Accounts receivable unbilled, net - noncurrent	10,207	18,846
Accounts receivable trade, net - noncurrent	7,852	18,605
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including current maturities	$ 229,673	$ 243,865