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Long-Term Debt and Commitments Related to Letters of Credit (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of long-term debt [Table Text Block]
Our long-term debt consisted of the following:
September 30,
2023		December 31,
2022
Revolving credit facility:  
Swing-line borrowings$26,262 $25,433 
SOFR borrowings180,000 125,000 
 206,262 150,433 
Senior unsecured notes:
3.99% Senior unsecured notes
50,000 50,000 
4.00% Senior unsecured notes
25,000 25,000 
75,000 75,000 
Term loans42,284 29,680 
 323,546 255,113 
Less debt issuance costs404 519 
Less current portion48,875 23,826 
 $274,267 $230,768