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Income taxes (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal statutory rate	34.00%	34.00%	(34.00%)
Effect of:
State income taxes (net of federal tax benefit)	3.00%	3.00%	(3.00%)
Taxes on foreign income at rates that differ from U.S. statutory rate	(21.80%)	(18.30%)	(29.00%)
Change in valuation allowance on deferred tax assets	0.00%	0.00%	(19.20%)
Increase in unrecognized tax benefits	1.40%	9.00%	45.70%
Other	0.20%	(1.90%)	1.00%
Effective tax rate	16.80%	25.80%	(38.50%)

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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