The 3cs re alcoholism are you did not cause it, you cannot control it and you cannot cure it.
Women in poor relationships write the good dad comment when they can think of nothing else positive to write about their man. And you have nothing at all positive to write about your man.
What are you getting out of this relationship now?. Your own needs re your own codependency may be being met but what are your children learning about relationships from the two of you here?. They are learning from you both a shedload of damaging lessons. Is this really the legacy you want to be showing them?. You're not fully emotionally available to your children either because you remain constantly preoccupied about his drinking. The effects of all this on your now teens is incalculable but it will come back to haunt them in adulthood as it will continue to do for you.
Did you grow up yourself seeing a parent drink heavily?.
Why are you and he still together at all?. For the kids?. Please tell me you have not stayed with him because of them.
Talking to an alcoholic about his drinking is about as effective an action as peeing in the ocean. Like so many alcoholics he remains in denial and you in turn are carrying out the usual roles associated with such spouses; codependent partner, enabler and provoker because you never forget.
He is NOT a good dad to his children nor is really any sort of husband to you if he is an alcoholic. His primary relationship is with drink, not you people and its never been with you either. He is "functioning" until he one day does not. There are no guarantees re alcoholism; he could go onto lose everything and everyone around him and he could still choose to drink afterwards.
What is the longest period of time to your direct knowledge has your H gone without alcohol?. Your H has a long standing and well built up tolerance to alcohol and he is likely always on a comedown from it. He's never completely sober and I daresay his employers have noticed something even if they have not said anything directly to him. And if they did, he would not tell you anyway.
You cannot help him nor save him but you can and should certainly help your own self a lot more. Attending Al-anon meetings would be a good start for you as would seeking legal advice re the children.