Annual report pursuant to Section 13 and 15(d)

FINANCING ARRANGEMENTS - Revolving credit facility (Details)

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FINANCING ARRANGEMENTS - Revolving credit facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 12, 2021
Jul. 20, 2018
Letters of credit          
Financing arrangements          
Maximum borrowing capacity   $ 10,000      
Revolving credit agreement          
Financing arrangements          
Debt instrument, face $ 150,000        
Outstanding borrowings $ 0 $ 0      
Aggregate amount committed       $ 150,000 $ 110,000
Interest rate 9.50% 5.25%      
Available borrowing capacity $ 106,800 $ 113,900      
Interest expense $ 2 $ 4 $ 479    
Revolving credit agreement | LIBOR          
Financing arrangements          
Spread on variable rate 3.50%