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Income taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Income Tax Uncertainties [Abstract]
Highly certain tax positions	$ 15,700	$ 15,100
Other unrecognized tax benefits	800	800
Other unrecognized tax benefits	16,500	15,900
Other unrecognized tax benefits	$ 100	$ 100

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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