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Recently issued accounting standards Recently issued accounting standards (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Retained earnings |  | $ 2,427,599 |  | $ 2,285,886
Reserve for returns and allowances |  | $ 4,200 |  | $ 0
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Retained earnings |  |  | $ 1,200 |
ASU 2016-02 | Forecast | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease, right-of-use asset | $ 110,000 |  |  |
ASU 2016-16 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
New accounting pronouncement or change in accounting principle, cumulative effect of change on equity or net assets |  |  | $ 1,800 |
Subsequent Event | ASU 2016-02 | Forecast | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating lease, right-of-use asset | 90,000 |  |  |
Lease liabilities | 90,000 |  |  |
Subsequent Event | ASU 2016-02 | Forecast | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease liabilities | $ 110,000 |  |  |

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