.J. Lavino Co., 430 F.2d 1065, 1071 (5th Cir.I 970) (recognizing well- established principle that intervention after judgment usually not granted); Reeves v. Wilkes, 754 F.2d 965, 971 ( I 1th Cir.1985) (affirming intervention denial in part because time and effort spent to formulate settlement of case would be