Windstream Corp. is reducing its workforce by 400 workers, or about 3 percent, to increase its operational efficiency. The telecommunications company said it will make the cuts by March 3. About 175 of the positions are being eliminated through a voluntary separation initiative, Windstream said in a release. The company currently has about 13,500 employees, 800 in Iowa, with about 20 workers in Des Moines. The Iowa workforce will be reduced by about 20 positions. The reductions are expected to result in annualized savings of approximately $20 million. The company in November reported third-quarter revenues of $1.5 billion, a decline of 3 percent from the same period in 2012. Based in Little Rock, Ark., Windstream acquired Iowa Telecommunications Services Inc. in 2009.