Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment

	Useful Lives		December 31,
	(Years)		2011		2010
Land		—	$	59,137	$	55,638
Land improvements		5 – 30		50,302		48,798
Buildings and improvements		10 – 45		186,444		204,858
Machinery and equipment(a)		3– 19		1,552,557		1,484,515
Machinery and equipment (major plant components)(b)		20– 45		541,953		502,906
Property, plant and equipment under capital lease(c)		19– 50		24,652		24,652
Long-term mineral rights and production equipment costs		7– 60		62,245		60,630
Construction in progress		—		142,138		58,181
Total			$	2,619,428	$	2,440,178

(a) Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 3 – 7 years, and (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years.

(b) Consists primarily of (1) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (2) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years.

(c) Assets under capital lease are primarily machinery and equipment with useful lives ranging from 19 – 25 years. Includes a building with a cost of $1.3 million which has a useful life of 50 years.