Write a comprehensive analysis of Nick Bostrom's Simulation Argument. Detail the three possible premises: 1) Almost all civilizations at our level of development become extinct before reaching a post-human stage. 2) The fraction of post-human civilizations that are interested in running ancestor-simulations is negligibly small. 3) We are almost certainly living in a computer simulation. Evaluate the implications of each premise for current philosophical thought and discuss the empirical evidence that could refute or support this theory.