(4) Earnings before interest, taxes, depreciation and amortization (“EBITDA”) is calculated as net income attributable to Holly Energy Partners plus (i) interest expense, net of interest income, (ii) state income tax and (iii) depreciation and amortization (excluding Predecessor amounts). EBITDA is not a calculation based upon GAAP. However, the amounts included in the EBITDA calculation are derived from amounts included in our consolidated financial statements. EBITDA should not be considered as an alternative to net income attributable to Holly Energy Partners or operating income, as an indication of our operating performance or as an alternative to operating cash flow as a measure of liquidity. EBITDA is not necessarily comparable to similarly titled measures of other companies. EBITDA is presented here because it is a widely used financial indicator used by investors and analysts to measure performance. EBITDA also is used by our management for internal analysis and as a basis for compliance with financial covenants.

   
Set forth below is our calculation of EBITDA.

Three Months Ended December 31,

Year Ended December 31,
2012   2011 2012   2011
(In thousands)
Net income attributable to Holly Energy Partners $ 27,039 $ 30,894 $ 94,152 $ 79,799
Add (subtract):
Interest expense 11,111 9,508 40,141 34,706
Amortization of discount and deferred debt charges 530 309 1,946 1,212
Loss on early extinguishment of debt 2,979
Increase in interest expense – non-cash charges attributable to interest rate swaps and swap settlement costs 1,273 41 5,095 41
State income tax 83 65 371 234
Depreciation and amortization 14,660 10,554 57,461 36,958
Predecessor depreciation and amortization   (1,643

)
(7,903 ) (3,184 )
EBITDA $ 54,696   $ 49,728   $ 194,242   $ 149,766  

(5) Distributable cash flow is not a calculation based upon GAAP. However, the amounts included in the calculation are derived from amounts presented in our consolidated financial statements, with the general exception of maintenance capital expenditures. Distributable cash flow should not be considered in isolation or as an alternative to net income attributable to Holly Energy Partners or operating income, as an indication of our operating performance, or as an alternative to operating cash flow as a measure of liquidity. Distributable cash flow is not necessarily comparable to similarly titled measures of other companies. Distributable cash flow is presented here because it is a widely accepted financial indicator used by investors to compare partnership performance. It also is used by management for internal analysis and our performance units. We believe that this measure provides investors an enhanced perspective of the operating performance of our assets and the cash our business is generating.

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