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Debt - Summary of Long-Term Debt (Details) - USD ($)
Dec. 31, 2021
Dec. 15, 2021
Dec. 31, 2020
May 23, 2016
Long-term debt        
Total credit facility availability $ 400,000,000   $ 300,000,000  
Balance outstanding 50,000,000   54,600,000  
Standby letters of credit 1,740,000   1,740,000  
Amount available, subject to covenant restrictions 348,260,000   243,660,000  
Revolving Credit Facility Due 2024        
Long-term debt        
Total credit facility availability   $ 400,000,000   $ 300,000,000
Balance outstanding $ 50,000,000   $ 54,600,000  
Weighted-average interest rate 1.16%   1.92%