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Income taxes (Tables)

3 Months Ended

Mar. 31, 2012

Significant components of unrecognized tax positions

The components of our unrecognized tax positions are as follows:



	March 31, 2012		December 31, 2011
Highly certain tax positions	$	15,700	$	15,100
Other unrecognized tax benefits	800		800
Gross unrecognized tax benefits	$	16,500	$	15,900
Accrued interest and penalties related to unrecognized tax benefits	100		100

- Definition

Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination.

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