Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2011

Supplemental Cash Flow Information [Abstract]

Supplemental Disclosure of Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION

Years ended December 31,	2011			2010			2009
	(in thousands)
Non-cash investing and financing activities-
Property, plant and equipment acquired with accrued liabilities	$	37,529		$	48,879		$	24,571
Capitalized asset retirement costs	$	1,525		$	1,858		$	6,027
Refunding bond issuance — Industrial Development Revenue Bonds	$	—		$	—		$	17,000
Cash (paid) refunded during the period for-
Interest (net of amount capitalized)	$	(103,110	)	$	(101,947	)	$	(69,317	)
Income taxes, net	$	9,854		$	9,384		$	17,117