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Income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current |  |  |
Federal | $ 29,244 | $ 38,957 | $ 22,988
State | 2,331 | 2,221 | 959
International | 1,002 | 2,029 | 828
Total current | 32,577 | 43,207 | 24,775
Deferred |  |  |
Federal | 9,979 | (119) | 3,332
State | (272) | (111) | 209
International | (5,587) | 1,323 | 1,612
Total deferred | 4,120 | 1,093 | 5,153
Total provision for income taxes | 36,697 | 44,300 | 29,928
Net deferred tax asset [Abstract] |  |  |
Net operating loss carryforward (federal) | 4,130 | 5,394 |
Net Operating Loss Carryforward (state) | 13,682 | 12,751 |
Research and development carryforward | 3,647 | 3,545 |
Scientific research and experimental development credit carryforward | 16,594 | 25,771 |
Intangible assets | 0 | 5,792 |
Stock compensation | 8,389 | 9,391 |
Foreign deferrals | 58,647 | 80,920 |
Inventory reserves | 2,273 | 3,754 |
Other | 5,569 | 8,484 |
Deferred tax asset | 112,931 | 155,802 |
Fixed assets | (30,728) | (31,925) |
Intangible assets | (5,882) | (4,760) |
Other | (16,047) | (17,192) |
Deferred tax liability | (52,657) | (53,877) |
Valuation allowance | (54,178) | (90,639) |
Net deferred tax asset | 6,096 | 11,286 |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 54,178 | 90,639 |
Income tax reconciliation [Abstract] |  |  |
US | 63,330 | 117,385 | 76,909
International | 35,891 | 18,331 | 7,285
Earnings before taxes on income | 99,221 | 135,716 | 84,194
Federal tax at statutory rates | 34,738 | 47,475 | 29,468
State taxes, net of federal benefit | 529 | 852 | 650
Impact of foreign operations | (9,937) | (1,640) | (1,176)
Change in valuation allowance | 10,458 | (950) | 1,091
Effect of foreign rates | (720) |  |
Tax credits | (1,572) | (2,088) | (1,743)
Other differences | 1,823 | 733 | 126
Permanent differences | 1,378 | (82) | 1,512
Total provision for income taxes | $ 36,697 | $ 44,300 | $ 29,928
Effective annual tax rate | 37.00% | 33.00% | 36.00%
Research and Development Tax Credit [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward, amount | $ 3,700 |  |
Tax credit carryforwards, expiration date | Dec. 31, 2023 |  |
Canadian Federal Scientific Research And Experimental Development [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward, amount | $ 500 |  |
Tax credit carryforwards, expiration date | Dec. 31, 2027 |  |
Manitoba Scientific Research And Experimental Development [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward, amount | $ 16,100 |  |
Tax credit carryforwards, expiration date | Dec. 31, 2024 |  |
U.S. Federal Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 11,800 |  |
Operating loss carryforwards, expiration year | Dec. 31, 2026 |  |
State and Local Jurisdiction [Member] |  |  |
Net deferred tax asset [Abstract] |  |  |
Valuation allowance | $ (191,700) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 255,100 |  |
Operating loss carryforwards, expiration year | Dec. 31, 2018 |  |
Deferred Tax Assets, Valuation Allowance | $ 191,700 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 170,300 |  |
Period of change in the nature or conduct of business following change in ownership | 3 years |  |
U.S. Federal Tax Authority - Tax Effected [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | $ 4,100 |  |
State and Local Jurisdiction - Tax Effected [Member] |  |  |
Net deferred tax asset [Abstract] |  |  |
Valuation allowance | (10,300) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 13,700 |  |
Deferred Tax Assets, Valuation Allowance | 10,300 |  |
Canadian Federal Gross [Member] |  |  |
Net deferred tax asset [Abstract] |  |  |
Valuation allowance | (43,600) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 43,600 |  |
Canadian Federal Tax Effected [Member] |  |  |
Net deferred tax asset [Abstract] |  |  |
Valuation allowance | (11,700) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 11,700 |  |
Foreign Tax Authority Tax Effected [Member] |  |  |
Net deferred tax asset [Abstract] |  |  |
Valuation allowance | (43,900) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | $ 43,900 |  |

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