Goodwill	12 Months Ended
Dec. 31, 2015
Goodwill [Abstract]
Goodwill	Goodwill We performed our annual goodwill impairment testing as of July 1, 2015, which entailed an assessment of our reporting unit fair values relative to their respective carrying values that were derived using a combination of both income and market approaches. Our income approach utilizes the discounted future expected cash flows. Our market approach, which includes both the guideline public company and guideline transaction methods, utilizes pricing multiples derived from historical market transactions of other like-kind assets. Our discounted cash flows reflect estimates of future cash flows based on both historical and forward crack-spreads, forecasted production levels, operating costs and capital expenditures. Based on our testing as of July 1, 2015, the fair value of our Cheyenne reporting unit exceeded its carrying cost by approximately 8%. The fair value of our El Dorado and HEP reporting units substantially exceeded their respective carrying values. As of December 31, 2015, there have been no impairments to goodwill. Historically, the refining industry has experienced significant fluctuations in operating results over an extended business cycle including changes in prices of crude oil and refined products, changes in operating costs including natural gas and higher costs of complying with government regulations. It is reasonably possible that at some future downturn in refining operations that the goodwill related to our Cheyenne Refinery will be determined to be impaired. Such impairment charges could be material. As of December 31, 2015, we had goodwill assigned to our refining and HEP segments of $2,042.8 million and $289.0 million, respectively.

Goodwill

12 Months Ended

Dec. 31, 2015

We performed our annual goodwill impairment testing as of July 1, 2015, which entailed an assessment of our reporting unit fair values relative to their respective carrying values that were derived using a combination of both income and market approaches. Our income approach utilizes the discounted future expected cash flows. Our market approach, which includes both the guideline public company and guideline transaction methods, utilizes pricing multiples derived from historical market transactions of other like-kind assets. Our discounted cash flows reflect estimates of future cash flows based on both historical and forward crack-spreads, forecasted production levels, operating costs and capital expenditures. Based on our testing as of July 1, 2015, the fair value of our Cheyenne reporting unit exceeded its carrying cost by approximately 8%. The fair value of our El Dorado and HEP reporting units substantially exceeded their respective carrying values. As of December 31, 2015, there have been no impairments to goodwill.

Historically, the refining industry has experienced significant fluctuations in operating results over an extended business cycle including changes in prices of crude oil and refined products, changes in operating costs including natural gas and higher costs of complying with government regulations. It is reasonably possible that at some future downturn in refining operations that the goodwill related to our Cheyenne Refinery will be determined to be impaired. Such impairment charges could be material.

As of December 31, 2015, we had goodwill assigned to our refining and HEP segments of $2,042.8 million and $289.0 million, respectively.