Silicon pixel detectors are at the core of the current and planned upgrade of the ATLAS detector at the Large Hadron Collider (LHC). As the closest detector component to the interaction point, these detectors will be subjected to an extreme amount of radiation over their lifetime. Monitoring and modeling this radiation damage is critical for informing detector operations and offline data analysis. I will discuss recent measurements of the non-ionizing energy loss in the pixel sensors using a variety of methods (leakage current, depletion voltage, Lorentz angle, charge collection efficiency). Several key features are not reproduced by the simulations, which has important implications for safety factors for detector upgrades and projections for future operating conditions.