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Income taxes (Details 1)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Federal statutory rate (34.00%) 34.00% 34.00%
Effect of:      
State income taxes (net of federal tax benefit) (2.10%) 3.00% 3.00%
Taxes on foreign income at rates that differ from U.S. statutory rate (0.60%) (21.80%) (18.30%)
Change in valuation allowance on deferred tax assets 106.30% 0.00% 0.00%
Increase in unrecognized tax benefits 1.60% 1.40% 9.00%
Other 2.60% 0.20% (1.90%)
Effective tax rate 73.80% 16.80% 25.80%