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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
1 Months Ended 6 Months Ended
May. 31, 2012
Jun. 30, 2015
USD ($)
unions
Dec. 31, 2014
USD ($)
sites
Guarantees [Abstract]      
Liability recorded related to guarantees   $ 600  
Maximum amount of obligation under guarantee contracts   4,200  
Notes receivable - affiliate   $ 12,059 $ 14,657
Collective bargaining agreements [Abstract]      
Percentage of personnel represented by collective bargaining agreements   45.00%  
Number of unions (in unions) | unions   2  
Letter of credit provided   $ 610,000  
Pending litigation [Abstract]      
Estimated litigation liability   3,000 $ 2,900
Environmental remediation costs [Abstract]      
Number of sites for environmental cleanup (in number of sites) | sites     12
Standby Letter of Credit      
Collective bargaining agreements [Abstract]      
Letter of credit provided   13,100  
Letter of Credit, Separate Facility      
Collective bargaining agreements [Abstract]      
Letter of credit provided   $ 87,600  
Energenic      
Guarantees [Abstract]      
Equity interest   50.00%  
Energenic | UMM Energy Partners, LLC      
Guarantees [Abstract]      
Contract term (in years) 30 years    
Energenic | UMM Energy Partners, LLC | Maximum      
Guarantees [Abstract]      
Annual obligations under the agreement   $ 2,400  
LVE Energy Partners      
Guarantees [Abstract]      
Notes receivable - affiliate   8,400  
Parental Guarantee      
Guarantees [Abstract]      
Guaranteed amount   $ 5,900