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LEASES: (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Leases    
Lessee, operating lease, option to extend false  
Lessee, operating lease, option to terminate false  
The weighted average remaining lease term 9 years  
The weighted average discount rate 3.69%  
Total lease expense $ 86,700,000 $ 87,000,000.0
Maturities of lease liabilities    
2020 28,900,000  
2021 115,500,000  
2022 112,600,000  
2023 111,500,000  
2024 103,600,000  
After 2024 826,300,000  
Total lease payments 1,298,400,000  
Less: interest on lease liabilities (303,700,000)  
Lease liabilities 994,700,000  
Cost of sales (exclusive of depreciation, amortization and depletion)    
Leases    
Total lease expense 86,400,000 86,800,000
Selling, general and administrative    
Leases    
Total lease expense $ 200,000 100,000
Minimum    
Leases    
Remaining lease terms 2 years  
Maximum    
Leases    
Underlying asset value $ 10,000  
Total nominal contract value $ 100,000  
Remaining lease terms 13 years  
Short term lease costs $ 100,000  
Maximum | Exploration    
Leases    
Total lease expense $ 100,000 $ 100,000