Rate hikes are common these days, no matter the company. A few factors that are causing this:

-Hail storm claims
-Influx of people coming here (thats a lot of new risks coming in each month that haven't been built into that years' rate structure)
-New tech on cars means higher repair costs each year.
-Body shop rates arent going down either
-Colorado is now at 20% uninsured, last I heard earlier this year. Hence why you saw the spike in UM coverage cost.

That's just to name a few of the challenges to keep rates level. It's VERY hard to do in Colorado.