Risk Management	3 Months Ended
Mar. 31, 2013
Risk Management [Abstract]
Concentration Risk Disclosure [Text Block]	Risk Management We are subject to various risks and uncertainties in the ordinary course of business due, in part, to the competitive global nature of the industry in which we operate, changing commodity prices for the materials used in the manufacture of our products and the development of new products. The functional currency of certain foreign operations in Mexico is the Mexican peso. The settlement of accounts receivable and accounts payable for our operations in Mexico requires the transfer of funds denominated in the Mexican peso, the value of which increased by 5 percent in relation to the U.S. dollar in the first quarter of 2013. Foreign currency transaction gains totaled $0.1 million and $0.2 million, in the first quarter of 2013 and 2012, respectively. All transaction gains and losses are included in other income (expense) in the condensed consolidated income statements. As it relates to foreign currency translation gains and losses, however, since 1990, the Mexican peso has experienced periods of relative stability followed by periods of major declines in value. The impact of these changes in value relative to our Mexico operations resulted in a cumulative unrealized translation loss at March 31, 2013 of $51.6 million. Translation gains and losses are included in other comprehensive income in the condensed consolidated statements of comprehensive income. When market conditions warrant, we may also enter into purchase commitments to secure the supply of certain commodities used in the manufacture of our products, such as aluminum, natural gas and other raw materials. At March 31, 2013 we have several purchase commitments in place for the delivery of natural gas during 2013 for a total cost of $1.9 million. These natural gas contracts are considered to be derivatives under U.S. GAAP, and when entering into these contracts, we expected to take full delivery of the contracted quantities of natural gas over the normal course of business. Accordingly, at inception, these contracts qualified for the normal purchase, normal sale (NPNS) exemption provided for under U.S. GAAP. As such, we do not account for these purchase commitments as derivatives unless there is a change in facts or circumstances in regard to the company's intent or ability to use the contracted quantities of natural gas over the normal course of business. Based on the quarterly analysis of our estimated future production levels, we believe that our remaining natural gas purchase commitments that were in effect as of March 31, 2013 will continue to qualify for the NPNS exemption since we can assert that it is probable we will take full delivery of the contracted quantities.

Risk Management

3 Months Ended

Mar. 31, 2013

Concentration Risk Disclosure [Text Block]

Risk Management

We are subject to various risks and uncertainties in the ordinary course of business due, in part, to the competitive global nature of the industry in which we operate, changing commodity prices for the materials used in the manufacture of our products and the development of new products.

The functional currency of certain foreign operations in Mexico is the Mexican peso. The settlement of accounts receivable and accounts payable for our operations in Mexico requires the transfer of funds denominated in the Mexican peso, the value of which increased by 5 percent in relation to the U.S. dollar in the first quarter of 2013. Foreign currency transaction gains totaled $0.1 million and $0.2 million, in the first quarter of 2013 and 2012, respectively. All transaction gains and losses are included in other income (expense) in the condensed consolidated income statements.

As it relates to foreign currency translation gains and losses, however, since 1990, the Mexican peso has experienced periods of relative stability followed by periods of major declines in value. The impact of these changes in value relative to our Mexico operations resulted in a cumulative unrealized translation loss at March 31, 2013 of $51.6 million. Translation gains and losses are included in other comprehensive income in the condensed consolidated statements of comprehensive income.

When market conditions warrant, we may also enter into purchase commitments to secure the supply of certain commodities used in the manufacture of our products, such as aluminum, natural gas and other raw materials. At March 31, 2013 we have several purchase commitments in place for the delivery of natural gas during 2013 for a total cost of $1.9 million. These natural gas contracts are considered to be derivatives under U.S. GAAP, and when entering into these contracts, we expected to take full delivery of the contracted quantities of natural gas over the normal course of business. Accordingly, at inception, these contracts qualified for the normal purchase, normal sale (NPNS) exemption provided for under U.S. GAAP. As such, we do not account for these purchase commitments as derivatives unless there is a change in facts or circumstances in regard to the company's intent or ability to use the contracted quantities of natural gas over the normal course of business. Based on the quarterly analysis of our estimated future production levels, we believe that our remaining natural gas purchase commitments that were in effect as of March 31, 2013 will continue to qualify for the NPNS exemption since we can assert that it is probable we will take full delivery of the contracted quantities.