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LONG-TERM DEBT (Details) - USD ($)
$ in Millions
6 Months Ended
May 03, 2016
Jan. 01, 2015
Jun. 30, 2016
Jan. 11, 2016
Jan. 10, 2016
Dec. 24, 2014
Dec. 19, 2014
Universal Service Administrative Company              
Long-term debt              
Commitment fee (as a percent)     1.75%        
Amended Credit Facility [Member]              
Long-term debt              
Maximum borrowing capacity       $ 400.0 $ 275.0    
Term loans | Ahana Debt              
Long-term debt              
Term loan assumed           $ 38.9  
Outstanding debt     $ 29.7        
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%        
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%        
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%        
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%        
Basis spread on variable rate (as a percent)     0.75%        
Revolving credit facility | Amended Credit Facility [Member] | Amended Credit Facility [Member]              
Long-term debt              
Maximum borrowing capacity       200.0      
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%        
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%        
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        
Letter of credit sub-facility | Amended Credit Facility [Member]              
Long-term debt              
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
KeyTech [Member]              
Long-term debt              
Termination of facility   $ 24.7          
Outstanding debt     $ 33.8        
KeyTech [Member] | Three month LIBOR              
Long-term debt              
Basis spread on variable rate (as a percent) 3.25%            
Outstanding debt $ 35,400.0            
Basis spread on variable rate (as a percent) 3.25%            
KeyTech [Member] | Amended Credit Facility [Member] | Amended Credit Facility [Member]              
Long-term debt              
Secured debt principal amount       60.0      
KeyTech [Member] | Amended Credit Facility [Member] | Amended Credit Facility [Member] | Maximum              
Long-term debt              
Potential cash dividend       $ 13.0