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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Restricted Cash Deposits Amounts included in restricted cash represent cash deposits primarily invested in interest bearing accounts that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf:
 September 30, 2020December 31, 2019
Workers' compensation$39,141 $38,944 
Black lung12,770 12,706 
Reclamation-related obligations69,148 67,868 
Financial guarantees and other3,006 3,006 
Contingent revenue obligation escrow7,104 12,363 
Total restricted cash131,169 134,887 
Less current portion (1)
(7,104)(12,363)
Restricted cash, net of current portion$124,065 $122,524 
(1) Included within prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets.
Schedule of Restricted Investments and Deposit Assets
Amounts included in restricted investments consist of certificates of deposit, mutual funds, and U.S. treasury bills that are restricted as to withdrawal as required by certain agreements entered into by the Company and provide collateral for securing the following obligations which have been written on the Company’s behalf:
 September 30, 2020December 31, 2019
Workers' compensation$3,131 $3,100 
Reclamation-related obligations24,662 18,786 
Total restricted investments (1), (2)
$27,793 $21,886 
(1) Included within other non-current assets on the Company’s Condensed Consolidated Balance Sheets.
(2) As of September 30, 2020 and December 31, 2019, respectively, $26,015 and $13,508 are classified as trading securities and $1,778 and $8,378 are classified as held-to-maturity securities.

Deposits represent cash deposits held at third parties as required by certain agreements entered into by the Company to provide cash collateral to secure the following obligations which have been written on the Company’s behalf:
 September 30, 2020December 31, 2019
Reclamation-related obligations$19,660 $8,887 
Other operating agreements1,419 1,836 
Total deposits (1)
$21,079 $10,723 
(1) Included within prepaid expenses and other current assets and other non-current assets on the Company’s Condensed Consolidated Balance Sheets.