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Business Combinations (Details)
$ / shares in Units, $ in Thousands, T in Millions
 3 Months Ended 9 Months Ended
Sep. 18, 2020
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
T
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
T
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]          
Base price consideration $ 2,000        
Business Acquisition, Volume Weighted Average Share Price | $ / shares $ 1.33        
Business Acquisition, Share Price | $ / shares $ 1.37        
Total purchase consideration $ 2,060        
Shares issued 1,504        
Processing capacity | T   5.5   5.5  
Cash $ 309        
Accounts receivable 75        
Inventory 2,459        
Prepaid expenses and other current assets 123        
Property, plant and equipment 60,310        
Right-of-use assets 9,603        
Total assets acquired 72,879        
Accounts payable 16        
Business Combination, Liabilities Assumed, Accrued Expense and Other Liabilities 2,010        
Asset retirement obligations 8,424        
Operating lease liabilities 9,603        
Deferred income taxes 10,877        
Total liabilities assumed 30,930        
Estimated fair value of net assets acquired $ 41,949        
Business Acquisition, Pro Forma Revenue   $ 23,442 $ 78,115 $ 105,852 $ 226,942
Business Acquisition, Pro Forma Net Income (Loss)   $ 34,614 $ 12,297 $ 39,700 $ 33,484
Maximum          
Business Acquisition [Line Items]          
Interest rates on notes   7.49%   7.49%  
Maximum | Acquisition Liquidity Support Facility          
Business Acquisition [Line Items]          
Interest rates on notes   8.00%   8.00%  
Eagle Materials Holdings [Member]          
Business Acquisition [Line Items]          
Processing capacity | T   3.5   3.5  
Business Combination, Acquisition Related Costs   $ 817   $ 875  
Eagle Materials Holdings [Member] | BNSF [Member]          
Business Acquisition [Line Items]          
Processing capacity | T   1.6   1.6