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FAIR VALUE MEASUREMENT, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
3 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Liabilities under derivative contracts [Abstract]      
Impairment charges for goodwill, indefinite-lived cable television franchises, trademarks and other indefinite-lived intangible assets $ 0    
Fair Value Measured on a Recurring Basis      
Assets:      
Money market funds   $ 706,792,000 $ 736,330,000
Investment securities   132,000 132,000
Investment securities pledged as collateral   1,291,664,000 1,245,916,000
Prepaid forward contracts   30,814,000 7,317,000
Liabilities under derivative contracts [Abstract]      
Prepaid forward contracts   36,495,000 102,217,000
Fair Value Measured on a Recurring Basis | Level I      
Assets:      
Money market funds   706,792,000 736,330,000
Investment securities   132,000 132,000
Investment securities pledged as collateral   1,291,664,000 1,245,916,000
Prepaid forward contracts   0 0
Liabilities under derivative contracts [Abstract]      
Prepaid forward contracts   0 0
Fair Value Measured on a Recurring Basis | Level II      
Assets:      
Money market funds   0 0
Investment securities   0 0
Investment securities pledged as collateral   0 0
Prepaid forward contracts   30,814,000 7,317,000
Liabilities under derivative contracts [Abstract]      
Prepaid forward contracts   36,495,000 102,217,000
Fair Value Measured on a Recurring Basis | Level III      
Assets:      
Money market funds   0 0
Investment securities   0 0
Investment securities pledged as collateral   0 0
Prepaid forward contracts   0 0
Liabilities under derivative contracts [Abstract]      
Prepaid forward contracts   $ 0 $ 0