Accrued Liabilities

12 Months Ended

Dec. 31, 2011

Accrued Liabilities [Abstract]

Accrued Liabilities

13. Accrued liabilities

The major components of accrued liabilities are:

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