Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Disclosures of Cash Flow Information [Abstract]

Schedule of Supplemental Disclosures of Cash Flow Information

	For the years ended December 31,
	2012		2011		2010
	(in thousands)
Cash paid during the year for interest, net of amounts capitalized	$	17,311	$	19,159	$	24,049
Cash paid during the year for income taxes		818		4,198		14,368
Increase (decrease) in noncash property additions	$	(26,240)	$	30,389	$	46,588