PROPERTY, PLANT & EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2012

Property Plant and Equipment

Balances of major classes of assets and allowances for depreciation, depletion and amortization at December 31 are as follows:

in thousands	2012		2011
Property, Plant & Equipment
Land and land improvements		$2,120,999		$2,122,350
Buildings		149,575		163,178
Machinery and equipment		4,195,165		4,206,870
Leaseholds		10,546		9,238
Deferred asset retirement costs		129,397		136,289
Construction in progress		60,935		67,621
Total, gross		$6,666,617		$6,705,546
Less allowances for depreciation, depletion and amortization		3,507,432		3,287,367
Total, net		$3,159,185		$3,418,179

Capitalized interest costs and Total Interest Costs Incurred

Capitalized interest costs with respect to qualifying construction projects and total interest costs incurred before recognition of the capitalized amount for the years ended December 31 are as follows:

in thousands	2012		2011		2010
Capitalized interest cost		$2,716		$2,675		$3,637
Total interest cost incurred before recognition of the capitalized amount		215,783		223,303		185,240