Being on a successful television show is a good thing. It's steady work. It's a chance to work with a group of people in an intimate way... where you develop a sort of shorthand with each other, and a trust.
A casting director who'd cast me in 'Assassins' sent a video to Kevin Reynolds, the director, and Mel Gibson, whose company is producing '187.' Then I went in and auditioned, and a few hours later, they called me.