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Income taxes - Significant Components of Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Operating Loss Carryforwards $ 339 $ 0
Deferred Tax Assets, Tax Credit Carryforwards 9,372 2,347
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 19,096 9,950
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances 8,812 9,466
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 20,398 14,484
Deferred Tax Assets, Gross 58,017 36,247
Deferred Tax Assets, Valuation Allowance (8,555) 0
Deferred Tax Assets, Net of Valuation Allowance 49,462 36,247
Deferred Tax Liabilities, Property, Plant and Equipment (6,937) (3,418)
Deferred Tax Liabilities, Goodwill and Intangible Assets (2,904) 0
Deferred Tax Liabilities, Gross (9,841) (3,418)
Deferred Tax Assets, Net $ 39,621 $ 32,829