Supplemental Disclosures of Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2012

Supplemental Disclosures of Cash Flow Information [Abstract]

Schedule of Supplemental Disclosures of Cash Flow Information

	For the three months ended March 31,
	2012	2011
	(in thousands)
Cash paid during the year for interest	$      26,452	$  24,857
Cash paid during the year for income taxes	68	16,000
Increase in noncash property additions	17,569	4,129