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Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory, Net [Abstract]

Schedule of Inventories

Inventories consist of the following:	March 31, 2013			December 31, 2012
Raw materials	$	43,408		$	40,725
Work-in-process	14,741			15,259
Finished goods	12,007			9,753
Operating and other supplies	86,659			94,188
Inventories	$	156,815		$	159,925

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- Definition

Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 2

-Paragraph 6

-Subparagraph a,b,c

-Article 5

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