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Summary of significant accounting policies, Part 6 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in deferred revenue | $ 15,022 | $ 4,602 | $ 3,474
Income tax expense (benefit) | $ 36,039 | $ 36,697 | $ 44,300
Accounting Standards Update 2016-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Change to estimated effective annual tax rate |  | 4.00% |
Income tax expense (benefit) |  | $ (3,300) |

X
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