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COMMITMENTS AND CONTINGENCIES, Legal Matters (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 08, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Version
Marchese, et al. v. Cablevision Systems Corporation and CSC Holdings, LLC      
Cable Operations Litigation [Abstract]      
Number of versions of complaint dismissed without prejudice by the District Court | Version     3
Loss contingency, loss in period   $ 12,800  
Selling, General and Administrative Expenses | Marchese, et al. v. Cablevision Systems Corporation and CSC Holdings, LLC      
Cable Operations Litigation [Abstract]      
Legal fees   9,500  
Sales Revenue, Net | Marchese, et al. v. Cablevision Systems Corporation and CSC Holdings, LLC      
Cable Operations Litigation [Abstract]      
Loss contingency, loss in period   $ 3,300  
Discontinued Operations, Disposed of by Sale | Compensation Related Claims      
Cable Operations Litigation [Abstract]      
Discontinued operations, legal matter expense     $ 21,000
Discontinued Operations, Disposed of by Sale | Subsequent Event | Compensation Related Claims      
Cable Operations Litigation [Abstract]      
Discontinued operations, legal matter expense $ 21,000    
Discontinued operations, partial reimbursement of settlement $ 6,000