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Property, Plant and Mine Development - Additional Information (Details)
3 Months Ended 6 Months Ended
Mar. 21, 2018
USD ($)
transload
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment            
Aggregate cost of machinery and equipment under capital lease   $ 2,225,737,000   $ 2,225,737,000   $ 1,522,675,000
Accumulated depreciation of machinery and equipment under capital lease   400,084,000   400,084,000   353,520,000
Gain on sale of transload facilities       5,619,000 $ (394,000)  
Consideration received allocated to asset retirement obligations liabilities of transload facilities       2,116,000    
Asset impairment charges   16,184,000 $ 0 16,184,000 0  
Permian, Eagle Ford, and Appalachian Basins | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CIG Logistics            
Property, Plant and Equipment            
Number of transload facilities sold | transload 3          
Total consideration received on sale of transload facilities $ 86,100,000          
Liabilities assumed by buyer on sale of transload facilities 2,200,000          
Cash consideration received on sale of transload facilities 83,900,000          
Gain on sale of transload facilities 5,800,000          
Consideration received allocated to asset retirement obligations liabilities of transload facilities 2,100,000          
Equipment note assumed the buyer on sale of transload facilities 100,000          
Consideration allocated to vendor incentives in sale of transload facilities 60,300,000          
Accrued contract termination costs for facilities operated by third parties on sale of transload facilities 7,900,000          
Settlement credit for contract termination costs on facilities operated by third parties on sale of transload facilities   2,700,000   2,700,000    
Permian, Eagle Ford, and Appalachian Basins | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CIG Logistics | Accounts payables and accrued liabilities            
Property, Plant and Equipment            
Consideration allocated to vendor incentives in sale of transload facilities   10,600,000   10,600,000    
Permian, Eagle Ford, and Appalachian Basins | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CIG Logistics | Other long-term obligations            
Property, Plant and Equipment            
Consideration allocated to vendor incentives in sale of transload facilities   46,300,000   46,300,000    
Assets Held under Capital Leases            
Property, Plant and Equipment            
Aggregate cost of machinery and equipment under capital lease   1,100,000   1,100,000   900,000
Accumulated depreciation of machinery and equipment under capital lease   200,000   200,000   200,000
Mining property and mine development            
Property, Plant and Equipment            
Aggregate cost of machinery and equipment under capital lease   1,051,824,000   1,051,824,000   $ 586,242,000
Interest cost capitalized in property, plant and mine development       $ 3,300,000 $ 0  
Transload Facilities | Permian, Eagle Ford, and Appalachian Basins | Disposal Group, Disposed of by Sale, Not Discontinued Operations | CIG Logistics            
Property, Plant and Equipment            
Consideration received allocated to fair value of transload facilities 25,800,000          
Net book value of transload facilities $ 20,000,000          
Resin Coating Facility            
Property, Plant and Equipment            
Asset impairment charges   $ 16,200,000