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Income Taxes Deferred income tax assets (liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Deferred tax assets and liabilities [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 2,749 | $ 0
Non-current deferred tax asset | 46,135 | 33,670
Deferred Tax Assets, Net | 23,288 | 20,565
Non-current deferred tax asset, gross total [Member] |  |
Deferred tax assets and liabilities [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 0 | 1,223
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 8,368 | 857
Noncurrent deferred tax asset - acquired future tax deductions | 10,580 | 6,473
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 8,633 | 11,089
Deferred Tax Assets, Unrealized Currency Losses | 3,425 | 5,175
Noncurrent deferred tax asset - tax credits state | 8,471 | 6,764
Deferred Tax Assets, Inventory | 10,658 | 1,938
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 636 | 151
Deferred Tax Assets, Valuation Allowance, Noncurrent | (7,385) | 0
Noncurrent deferred tax liability [Member] |  |
Deferred tax assets and liabilities [Line Items] |  |
Noncurrent deferred tax liability - depreciation and amortization | 21,005 | 10,027
Noncurrent deferred tax liability - state income taxes | 1,640 | 1,708
Noncurrent deferred tax liability - foreign | 202 | 1,370
Deferred Tax Liabilities, Net | $ 22,847 | $ 13,105

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