When are Kids of Divorce Most Likely to Get Divorced Themselves?

This recent study indicates that kids of divorce in general at at a higher risk for divorce, it is the kids that come from a particularly nasty marriage that are at the highest risk. In other words, if the relationship before the split was pretty friendly, the kids are less likely to get divorced later in life. Are their lots of friendly relationships getting divorced? I guess this would mean "the thrill is gone" but there is no real ugly discord.