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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Taxes [Abstract]          
Reversal of noncurrent liability relating to uncertain tax position   $ (53,132)      
Income tax expense 48,813   34,172 83,722 44,036
Effective tax rate (in hundredths) 40.00%   36.00% 25.00% 35.00%
Tax benefit from reversal of uncertain tax position liability   (53,132)      
Tax benefit resulting from a change in the rate used to measure deferred taxes   (2,632)      
Tax benefit related to increase in research credits     (589)   (3,289)
Tax benefit related to increase in research credits related to the year ended December 31, 2012         (1,800)
Tax benefit resulting from lower state tax rate on unrealized investment gains/losses     (935)   (2,101)
Effective tax rate absent certain items of tax expense or benefit (in hundredths)     38.00% 41.00% 40.00%
Federal net operating loss carry forward 471,000     471,000  
CSC Holdings, LLC [Member]
         
Income Taxes [Abstract]          
Income tax expense 79,007   67,541 172,032 137,718
Effective tax rate (in hundredths) 42.00%   41.00% 32.00% 41.00%
Tax benefit from reversal of uncertain tax position liability   (53,132)      
Tax benefit resulting from a change in the rate used to measure deferred taxes   $ (1,765)      
Effective tax rate absent certain items of tax expense or benefit (in hundredths)       42.00%