Accrued liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Major Components Of Accrued Liabilities

	December 31,
	2011 (Restated, see note 2)		2010 (Restated, see note 2)
Operating accruals	$	38,497	$	48,044
Accrued interest		9,711		9,857
Total	$	48,208	$	57,901