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Inventory	9 Months Ended
Inventory	Sep. 30, 2012
Inventory [Abstract]
Inventory	7. We did not incur any temporary LIFO (last in first out) liquidation gain for the nine months or the three months ended September 30, 2012. During the nine months and the three months ended September 30, 2011, we incurred a $1.0 million temporary LIFO liquidation gain due to reductions in finished cement and work in process inventory which was restored by the end of 2011. The temporary LIFO liquidation gains were deferred as a component of accrued liabilities.

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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