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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS      
Workers' compensation claims $ 53,384 $ 49,539 $ 54,439
Pneumoconiosis benefit claims 97,683 72,095  
Total obligations 151,067 121,634  
Less current portion (11,175) (11,137)  
Non-current obligations $ 139,892 $ 110,497