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ACQUISITIONS - Patriot Assets and Liabilities (Details) - Patriot Coal Corporation - USD ($)
$ in Thousands
1 Months Ended
Feb. 03, 2015
Feb. 28, 2015
Acquisitions    
Consideration transferred $ 47,874  
Recognized amounts of net tangible and intangible assets acquired and liabilities assumed:    
Inventories 1,994  
Property, plant and equipment, including mineral rights and leased facilities 32,029  
Customer contracts, net 19,193  
Asset retirement obligations (2,255)  
Other liabilities (3,087)  
Net tangible and intangible assets acquired $ 47,874  
Customer contracts and other, net    
Acquisitions    
Consideration transferred   $ 19,200
Customer contracts and other, net | Minimum    
Acquisitions, additional information    
Average term of the contracts 1 year  
Customer contracts and other, net | Maximum    
Acquisitions, additional information    
Average term of the contracts 3 years