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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, 2016
Dec. 31, 2015
Liabilities:    
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 853,138,000 $ 922,765,000
Investment securities 152,000 130,000
Investment securities pledged as collateral 1,311,853,000 1,211,982,000
Prepaid forward contracts 38,768,000 82,408,000
Liabilities:    
Prepaid forward contracts 7,078,000 2,706,000
Fair Value Measured on a Recurring Basis | Level I    
Assets:    
Money market funds 853,138,000 922,765,000
Investment securities 152,000 130,000
Investment securities pledged as collateral 1,311,853,000 1,211,982,000
Prepaid forward contracts 0 0
Liabilities:    
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 38,768,000 82,408,000
Liabilities:    
Prepaid forward contracts 7,078,000 2,706,000
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:    
Prepaid forward contracts $ 0 $ 0