Basecamp's maternity/paternity policy is "Paid Parental Leave: When you welcome a new baby, Basecamp encourages you to take up to 16 weeks maternity leave and up to 6 weeks paternity leave, at 100% paid salary. Single fathers, or primary care givers, can also take up to 16 weeks." (correct as of 2016)

As I understand it that's amazing compared to most American companies. It's roughly equivalent to what you get in progressive European countries.