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Spectral energy distributions (SEDs) from X-ray to far-infrared (FIR)wavelengths are presented for a sample of 1246 X-ray luminous active galacticnuclei (AGN; $L_{0.5-10\rm{keV}}>10^{43}$ erg s$^{-1}$), with$z_{\rm{spec}}<1.2$, selected from Stripe 82X, COSMOS, and GOODS-N/S. Therest-frame SEDs show a wide spread ($\sim2.5$ dex) in the relative strengths ofbroad continuum features at X-ray, ultraviolet (UV), mid-infrared (MIR), andFIR wavelengths. A linear correlation (log-log slope of 0.7$\pm0.04$) is foundbetween $L_{\rm{MIR}}$ and $L_{\rm{X}}$. There is significant scatter in therelation between the $L_{\rm{UV}}$ and $L_{\rm{X}}$ due to heavy obscuration,however the most luminous and unobscured AGN show a linear correlation (log-logslope of 0.8$\pm0.06$) in the relation above this scatter. The relation between$L_{\rm{FIR}}$ and $L_{\rm{X}}$ is predominantly flat, but with decreasingdispersion at $L_{\rm{X}}>10^{44}$ erg s$^{-1}$. The ratio between the "galaxysubtracted" bolometric luminosity and the intrinsic $L_{\rm{X}}$ increases froma factor of $\sim$$10-70$ from log $L_{\rm{bol}}/{\rm(erg\;s}^{-1})=44.5-46.5$. Characteristic SED shapes have been determined by groupingAGN based on relative strengths of the UV and MIR emission. The average$L_{1\mu\rm{m}}$ is constant for the majority of these SED shapes, while AGNwith the strongest UV and MIR emission have elevated $L_{1\mu\rm{m}}$,consistent with the AGN emission dominating their SEDs at optical and NIRwavelengths. A strong correlation is found between the SED shape and both the$L_{\rm{X}}$ and $L_{\rm{bol}}$, such that$L_{\rm{bol}}/L_{\rm{X}}=20.4\pm1.8$, independent of the SED shape. This isconsistent with an evolutionary scenario of increasing $L_{\rm{bol}}$ withdecreasing obscuration as the AGN blows away circumnuclear gas.

The Accretion History of AGN: The Spectral Energy Distributions of X-ray Luminous AGN