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Long-Term Debt - Debt Covenant Compliance (Details)
Sep. 30, 2020
Jul. 06, 2020
Dec. 22, 2017
Long-term debt      
Interest rate (as a percent) 4.30%    
CRC Revolving Credit Facility      
Long-term debt      
Debt instrument, covenant, leverage ratio, maximum 6.35   0.00125
CRC Senior Secured Notes | Senior Notes      
Long-term debt      
Interest rate (as a percent) 5.75% 5.75%  
CRC Senior Secured Notes Due 2025 [Member] | Senior Notes      
Long-term debt      
Interest rate (as a percent) 5.25%