The broadband provider topped estimates in its second quarter.Shares of Charter Communications (CHTR 17.38%) were soaring after the nation's No. 2 cable company and owner of the Spectrum brand posted better-than-expected results in its second-quarter earnings report, even as it continues to lose broadband subscribers.As a result, the stock was up 16.5% as of 10:46 a.m. ET. Charter manages a challenging marketCharter said that total internet customers, which include both residential and business customers, f ...