US recovering with floor under the Autos and Housing with demand and latent demand picking up after years of excess weakness. China stimulus last year is now re-accelerating their growth.
US Central Bank, Euro banks, Japan Central bank increasing QE liquidity, making loans easier and forcing money from bond overinvestment into equities.
Rising economies are driving hunger for more oil energy to support wealth growth in commerce, consumers, and to explore/harvest/feed growing third world asian economies.
SD benefits from the above, and large successful investors such as T Boone Pickens prefer SD as a top stock to invest in. After the current anti-CEO criticism subsides, SD should go much higher.