$18,000 for a family is high but within the range of what insurance costs today. Family coverage on the small group market (<50 employees, which is where Matasano was at), which approximates the individual market in price, was ~$1100/mo a few years ago.
(I just looked it up and, weirdly, average premiums on the large group market in 2017 were higher than those in the small group market; on the small market, they're around $17,000, and in the large market, $19,000).