I once worked for IP for a short period of time. They try to keep it lean like most companies. Unfortunately, what's the use of keeping it lean if the people you have won't work or don't show up for work. With a union it's hard to fire people for that kind of thing.
I've worked in both Union and Non-union plants. It's not difficult to hold people accountable in either situation if you have fair and consistent administration of clearly defined rules and expectations.
I worked in a government union facility. One year we worked 21 days in a row 12 hours each. I was overpaid. This corporation is still overpaying and now is in so much debt that they will soon cut services to their customers. Unions kill businesses. GM, Chyrsler, the American steel industry. etc. And in cheesehead land where I reside the government unions are killing us taxpayers. Go Pack!