Should I accept or deny this trade?

I was offered Kyle Lohse (SP STL, 4-2, 2.24 ERA, 29K), Chris Young (SP NYM, 1-0, 1.88 ERA, 22K) and Houston Street (RP COL, 12 SV, 2.89 ERA) for Josh Johnson (SP FLA, 3-1, 1.63 ERA, 53K)