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5. Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Other Long-term Debt, Current $ 1,700 $ 1,800
Long-term debt, net of current maturities 10,901 12,258
Outstanding borrowings 0  
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]    
Debt Instrument [Line Items]    
Other Long-term Debt 12,600 $ 14,100
Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit maximum borrowing capacity $ 200,000  
Line of Credit Facility, Interest Rate at Period End 1.315%  
Standby Letters of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit maximum borrowing capacity $ 200