Set forth below is our calculation of distributable cash flow.

     
Three Months Ended June 30, Six Months Ended June 30,
2013   2012 2013   2012
(In thousands)
Net income attributable to Holly Energy Partners $ 20,167 $ 22,003 $ 38,566 $ 43,777
Add (subtract):
Depreciation and amortization 15,127 14,150 29,281 28,450
Predecessor depreciation and amortization (3,734 ) (7,459 )
Amortization of discount and deferred debt charges 533 503 1,063 875
Loss on early extinguishment of debt 383 2,979
Increase in interest expense - non-cash charges attributable to interest rate swaps 1,274 849 2,547
Increase (decrease) in deferred revenue attributable to shortfall billings 1,375 163 152 (429 )
Billed crude revenue settlement 917 918 1,835
Maintenance capital expenditures* (2,176 ) (1,292 ) (4,512 ) (1,599 )
Other non-cash adjustments 1,039   153   2,133   99  
Distributable cash flow $ 36,065   $ 34,520   $ 68,450   $ 71,075  
 

* Maintenance capital expenditures are capital expenditures made to replace partially or fully depreciated assets in order to maintain the existing operating capacity of our assets and to extend their useful lives. Maintenance capital expenditures include expenditures required to maintain equipment reliability, tankage and pipeline integrity, and safety and to address environmental regulations.
     
June 30, December 31,
2013 2012
(In thousands)
Balance Sheet Data
Cash and cash equivalents $ 8,716 $ 5,237
Working capital $ 10,825 $ 11,826
Total assets $ 1,386,711 $ 1,394,110
Long-term debt $ 799,152 $ 864,674
Partners' equity (4) $ 402,001 $ 352,653
 

(4) As a master limited partnership, we distribute our available cash, which historically has exceeded our net income attributable to Holly Energy Partners because depreciation and amortization expense represents a non-cash charge against income. The result is a decline in partners’ equity since our regular quarterly distributions have exceeded our quarterly net income attributable to Holly Energy Partners. Additionally, if the assets contributed and acquired from HollyFrontier while we were a consolidated variable interest entity of HollyFrontier had been acquired from third parties, our acquisition cost in excess of HollyFrontier’s basis in the transferred assets of $305.3 million would have been recorded as increases to our properties and equipment and intangible assets instead of decreases to partners’ equity.

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