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Preferred Members' Interest	9 Months Ended
Preferred Members' Interest	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Preferred Members' Interest	7. PREFERRED MEMBERS’ INTEREST In July 2001, we received a $150.0 million preferred membership investment (“PMI”) from the operating subsidiaries of Mediacom LLC, which has a 12% annual dividend, payable quarterly in cash. We paid $4.5 million in cash dividends on the PMI during each of the three months ended September 30, 2016 and 2015, and $13.5 million during each of the nine months ended September 30, 2016 and 2015.