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Commitments Due (Detail) (USD $)	Dec. 31, 2012
Capital Addition Purchase Commitments
Unconditional purchase obligations
2013	$ 3,880,000
Thereafter	0
Total	3,880,000
Noncapital
Unconditional purchase obligations
2013	15,432,000
2014-2015	20,062,000
2016-2017	6,363,000
Thereafter	8,725,000
Total	$ 50,582,000

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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