Colorado is an equitable distribution state, meaning that all marital property will be divided equitably during a divorce. That does not necessarily mean 50-50; the court will approve a decree that divides the property so that both parties walk away with roughly the same value amount. Debt will also be divided equitably.
Marital property is any property that the two spouses hold during the marriage, including value added to accounts, property or investments. Separate property, which won't be included in the division, includes property that is brought into the marriage (earned previously) or property that is specifically gifted to one spouse through inheritance.