Do mental hospitals, where someone would have to go for an extended period of time, still exist?

Mental Hospitals, not necessarily EXACTLY like “One Flew Over The Cuckoo’s Nest” but kind of like that, maybe a modern version of it. Do these still exists?

I am writing a story that takes place in 2014 and it involves someone that has been in a Mental Institution for an extended period of time. I wanted to do 6 years but if that’s unrealistic for these days I can say 2. But first I was wondering if these kinds of places even exist anymore. Where someone will be comitted to a hospital against their own will for a year or two?

It doesn’t matter what the hospital is like, so don’t get hung up on whether or not electric shock therapy still exists or if there are real life Nurse Rachids (sp?) – specifically the characteristic that someone may have to be live in a hospital for a year or two because they are deemed crazy/insane/dangerous but have not actually comitted any crimes.