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Inventories | 12 Months Ended
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Dec. 31, 2012
Inventories |
Inventories | Note 4. Inventories Our inventories have primarily been stated on the last-in, first-out ("LIFO") method, which is not in excess of market. We use the LIFO method of inventory valuation because it results in a better matching of costs and revenues. As of December 31, 2012 and 2011, cost on the first-in, first-out ("FIFO") method exceeded the LIFO value of inventories by $138.8 million and $202.9 million, respectively. Inventories of $243.7 million and $237.0 million as of December 31, 2012 and 2011, respectively, were stated on the FIFO method, which is not in excess of market. In 2012, cost decreases for the majority of our products were the primary cause of the $64.1 million reduction of the LIFO valuation reserve, which lowered cost of sales. Cost increases in 2011 and 2010 for the majority of our products were the primary cause of the $85.3 million and $34.8 million increase in the LIFO valuation reserve, respectively, which increased cost of sales. In 2012, 2011 and 2010 we generally increased our tons on-hand levels due to increased shipment levels. Consequently, there were insignificant liquidations of LIFO inventory quantities in 2012, 2011 and 2010.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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