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ACQUISITIONS - MAC (Details) - USD ($)
$ in Thousands
1 Months Ended
Jan. 01, 2015
Mar. 31, 2006
Dec. 31, 2015
Dec. 31, 2014
Acquisitions        
Goodwill     $ 136,399  
White County Coal | MAC        
Acquisitions        
Purchase of equity investment   $ 1,000    
MAC        
Acquisitions        
Equity interest (as a percent)       50.00%
Balance of equity investment       $ 1,600
Remaining equity interest acquired (as a percent) 50.00%      
Cash on hand $ 5,500      
Liabilities assumed 200      
Assets acquired 7,300      
Goodwill $ 4,200