Place your oven rack in the lowest position. Preheat to 350 degrees F. Score the fat with a sharp knife in a 1-inch crosshatch pattern without cutting through to the meat. Place the ham flat-side down in a roasting pan and add the chicken broth to the pan. Cover with foil and bake 1 1/2 hours.

Meanwhile, make the glaze: Whisk the honey, brown sugar, mustards, vinegar, hot sauce, thyme and red pepper flakes in a medium bowl. Remove 3/4 cup of the glaze to a separate bowl and set aside for serving. Remove the ham from the oven, discard the foil and brush with about one-quarter of the remaining glaze. Continue baking, brushing with the glaze and the pan juices every 30 minutes, until the ham is a deep reddish-brown and a thermometer inserted into the center registers 140 degrees F, 1 to 1 1/2 more hours. (Add 1/2 cup water to the pan if the juices dry out.)

Transfer the ham to a cutting board and let rest 20 minutes before slicing. Serve with the reserved glaze.