The flight instructor reported that he and the student pilot were prepared to land on runway 14 with partial flaps and reported wind from 190° at 17 knots. When they turned onto final approach, the instructor noticed that the airplane was too high and not aligned with the runway and that the airspeed was high. As the airplane approached the touchdown point, it encountered turbulence. The instructor took control of the airplane and executed a right-wing-low partial slip. The airplane touched down halfway down the 3,740-ft-long runway with a high ground speed. The instructor applied the brakes, and the wheels immediately locked, so he released the brakes and then tried reapplying them; however, the airplane did not decelerate. The airplane overran the runway and struck several airport lights and then traveled through two barbed-wire fences. The right main landing gear separated, the left main landing gear collapsed, and the fuselage and horizontal stabilizer sustained substantial damage. After the instructor and student exited the airplane, they noticed that the windsock indicated that they had landed with a strong quartering tailwind. The instructor said that the accident was due to the "undetected shift in wind direction - from a quartering headwind to a quartering/direct tailwind" and he and the student's incorrect decision to continue the approach and landing when the airplane was not stabilized.