The Steelers returned home to take on the Redskins.  Scoring began early in the game as the Steelers would score on Roethlisberger's 1-yard pass to Leonard Pope to take a 7-0 lead.  Shaun Suisham then kicked a 48-yard field goal to make it 10-0.  In the 2nd quarter, the Redskins got on the board as RG3 found Santana Moss for a 2-Yard TD Pass (with a blocked PAT) and the score was left at 10-6.  The Steelers didn't hesitate however as they pushed ahead by double-digits as Ben Roethlisberger connected with Heath Miller for a 7-yard pass to make the score 17-6.  Suisham increased their lead with a 27-yard field goal as the team lead 20-6 at halftime.  Coming into the 3rd quarter, the Redskins scored first with a 48-yard field goal from Kai Forbath to make the score 20-9.  However, the Steelers responded with Roethlisberger connecting with Will Johnson for a 1-Yard TD pass to make the score 27-9.  In the fourth quarter, the Redskins tried to rally a comeback as Forbath kicked a 45-yard field goal to make the score 27-12.  They would then be kept from scoring anymore points for the remainder of the game by the Steelers' defense. With the win, the Steelers improved to over .500 and outright second place in the AFC North at 4-3 and also 3-0 during home games.
Question: How many points did the Steelers win by?
Answer: 15