MDU Resources produces and supplies products and services in the energy sector as well as owns and operates heavy civil construction companies in 48 states. MDU stated culture is to promote from within and employees are notified every week of 100's of job openings across the company, giving existing employees opportunities for movement figuratively and physically.
Cons
Many in management (of which I was) practice "silo mentality" which costs the company millions of dollars in lost production. Middle management is also too fat in many instances. Also, pay rates for hourly employees is ridiculously low. I managed several hundred and it took me almost six months and several justification emails to get 5 -10% increases and some of these employees had been with the company between 15-20 years.