8. They're accountable.
If you're a manager trying to decipher a bungled report, "It's not my fault" is the most irritating phrase in the English language. Exceptional employees are accountable. They own their work, their decisions, and all of their results—good or bad. They bring their mistakes to management's attention rather than hoping no one will find out. They understand that managers aren't out to assign blame; they're out to get things done.