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5. Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Other Long-term Debt, Current $ 500 $ 500
Long-term debt, net of current maturities 1,196,739 10,514
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]    
Debt Instrument [Line Items]    
Other Long-term Debt $ 10,900 $ 11,000