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Description Of Business And Presentation Of Financial Statements (Policy)	6 Months Ended
	Jun. 30, 2011
Description Of Business And Presentation Of Financial Statements
Accounts Receivable	*Accounts Receivable* Our accounts receivable consist of amounts due from customers that are primarily companies in the petroleum industry. Credit is extended based on our evaluation of the customer's financial condition and in certain circumstances, collateral, such as a letter of credit or guarantee, is required. Our credit losses, which historically have been minimal are charged to income when accounts are deemed uncollectible. At June 30, 2011, our allowance for doubtful accounts reserve was $2.6 million.
Inventories	*Inventories* We use the last-in, first-out ("LIFO") method of valuing inventory. Under the LIFO method, an actual valuation of inventory can only be made at the end of each year based on the inventory levels at that time. Accordingly, interim LIFO calculations are based on management's estimates of expected year-end inventory levels and are subject to the final year-end LIFO inventory valuation.

Describes an entity's accounting policies covering its major classes of inventories, bases of stating inventories (for example lower of cost or market), methods by which amounts are added and removed from inventory classes (for example FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this description includes the nature of the cost elements included in inventory.

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- Definition

Describes an entity's accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs.

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