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Significant Transactions - Lease Option Agreement for American Flat Processing Facility (Details) - American Flat Property - Lease Option Agreement
$ in Millions
Nov. 18, 2019
USD ($)
$ / T
Phase 1  
Schedule of Equity Method Investments [Line Items]  
Annual reimbursements under facility lease $ 1.1
Annual rental income under processing facility $ 1.0
Rental fee per ton processed | $ / T 1
Potential rental income under processing facility lease $ 15.0
Phase 2  
Schedule of Equity Method Investments [Line Items]  
Annual rental income under processing facility $ 1.0
Rental fee per ton processed | $ / T 0.50
Potential rental income under processing facility lease $ 10.0