Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Liabilities [Abstract]

Major Components Of Accrued Liabilities

	December 31,
	2011		2010
Operating accruals	$	34,790	$	45,213
Accrued interest		9,711		9,857
Total	$	44,501	$	55,070