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Derivative Instruments
3 Months Ended
Mar. 31, 2015
Derivative Instruments
5. Derivative Instruments

Natural gas is used to fire the kilns at the Company’s domestic manufacturing plants. In an effort to mitigate potential volatility in the cost of natural gas purchases and reduce exposure to short-term spikes in the price of this commodity, from time to time, the Company enters into contracts to purchase a portion of the anticipated monthly natural gas requirements at specified prices. Contracts are geographic by plant location. Historically, the Company has taken delivery of all natural gas quantities under contract, which exempted the Company from accounting for the contracts as derivative instruments. However, due to the severe decline in industry activity during the first quarter of 2015, the Company significantly reduced production levels and consequently did not take delivery of all of the contracted natural gas quantities. As a result, during the three months ended March 31, 2015, the Company began accounting for relevant contracts as derivative instruments, which requires the gas contracts to be recognized as either assets or liabilities at fair value with an offsetting entry in earnings. As a result, during the three months ended March 31, 2015, the Company recognized a loss of $12,547 in cost of sales on the recognition of derivative instruments. The cumulative present value losses on these natural gas derivative contracts as of March 31, 2015 are presented as current and long-term liabilities, as applicable, in the Consolidated Balance Sheet. At March 31, 2015, the Company has contracted for delivery a total of 11,160,000 MMBtu of natural gas at an average price of $4.57 per MMBtu through December 31, 2018. Contracts covering 9,480,000 MMBtu are now subject to accounting as derivative instruments.