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Preferred Members' Interest	3 Months Ended
Preferred Members' Interest	Mar. 31, 2019
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 may voluntarily repay the PMI any time at par, and the operating subsidiaries of Mediacom LLC have the option to call for the redemption of the PMI upon the repayment of all of our outstanding senior notes. We paid $4.5 million in cash dividends on the PMI during the three months ended March 31, 2019 and 2018.