Kirkland-based WaveDivision Holdings, which operates the Wave Broadband and Astound Broadband cable systems in Washington, Oregon and California, has been acquired by private equity firms Oak Hill Capital and GI Partners. Financial details of the buy were not disclosed. WaveDivision was already owned by a private equity group, led by Sandler Capital Mangagement. The companies said that Wave was advised by RBC Capital Markets and Waller Capital, along with Dow Lohnes PLLC in the deal; Oak Hill Capital was advised by Deutsche Bank and Wells Fargo. Oak HIl Capital was advised by Paul, Weiss, Rifkind, Wharton & Garrison LLP, with GI Partners advised by Kirkland & Ellis LLP. Wave's various broadband cable systems serve more than 385,000 customers in the Seattle, San Francisco, Sacramento and Portland markets.