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LONG-TERM DEBT (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 24, 2014
Dec. 19, 2014
Amended Credit Facility [Member]      
Long-term debt      
Outstanding letters of credit $ 10.6    
Term loans | Ahana Debt      
Long-term debt      
Term loan assumed   $ 38.9  
Outstanding debt $ 31.3    
Term loans | Ahana Debt | Minimum      
Long-term debt      
Effective interest rate (as a percent) 4.50%    
Term loans | Ahana Debt | Maximum      
Long-term debt      
Effective interest rate (as a percent) 6.00%    
Term loans | Public Service Electric & Gas Note [Member]      
Long-term debt      
Stated interest rate 11.30%    
Revolving credit facility | Amended Credit Facility [Member]      
Long-term debt      
Maximum borrowing capacity     $ 225.0
Revolving credit facility | Amended Credit Facility [Member] | Minimum      
Long-term debt      
Commitment fee (as a percent) 0.175%    
Revolving credit facility | Amended Credit Facility [Member] | Minimum | LIBOR      
Long-term debt      
Basis spread on variable rate (as a percent) 1.50%    
Revolving credit facility | Amended Credit Facility [Member] | Minimum | Base rate      
Long-term debt      
Basis spread on variable rate (as a percent) 0.50%    
Revolving credit facility | Amended Credit Facility [Member] | Maximum      
Long-term debt      
Commitment fee (as a percent) 0.25%    
Revolving credit facility | Amended Credit Facility [Member] | Maximum | LIBOR      
Long-term debt      
Basis spread on variable rate (as a percent) 1.75%    
Revolving credit facility | Amended Credit Facility [Member] | Maximum | Base rate      
Long-term debt      
Basis spread on variable rate (as a percent) 0.75%    
Swingline sub-facility | Amended Credit Facility [Member]      
Long-term debt      
Maximum borrowing capacity     10.0
Swingline sub-facility | Amended Credit Facility [Member] | Federal Funds Effective Rate      
Long-term debt      
Basis spread on variable rate (as a percent) 0.50%    
Swingline sub-facility | Amended Credit Facility [Member] | Minimum | Base rate      
Long-term debt      
Basis spread on variable rate (as a percent) 1.00%    
Letter of credit sub-facility      
Long-term debt      
Outstanding letters of credit $ 10.6    
Letter of credit sub-facility | Wholesale Mobility Funds      
Long-term debt      
Borrowings 0.0    
Outstanding letters of credit $ 10.6    
Letter of credit sub-facility | Amended Credit Facility [Member]      
Long-term debt      
Commitment fee (as a percent) 1.75%    
Maximum borrowing capacity     10.0
Letter of credit sub-facility | Amended Credit Facility [Member] | Wholesale Mobility Funds      
Long-term debt      
Maximum borrowing capacity     $ 25.0