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Income taxes - Income Tax Expense Reconciled to Federal Statutory Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances $ 8,812 $ 9,466  
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 18,405 63,341 $ 31,965
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 1,454 4,911 2,344
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 6,434 (13,305) (113)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount 2,390 8,050 2,982
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (21,891) (10,616) (5,637)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount 1,107 506 (790)
Income tax expense $ 16,454 $ 52,887 $ 30,751
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 2.80% 2.70% 2.60%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent 12.20% (7.40%) (0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent 4.50% 4.40% 3.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (41.60%) (5.90%) (6.20%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 8,555 $ 0 $ 0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent 16.30% (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 2.10% 0.40% (0.90%)
Effective Income Tax Rate Reconciliation, Percent 31.30% 29.20% 33.70%