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Recently issued accounting standards Recently issued accounting standards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to parent | $ (42,658) | $ 77,015 | $ 78,003 | $ 40,170 | $ 61,063 | $ 66,322 | $ 59,303 | $ 50,689 | $ 152,530 | $ 237,377 | $ 244,863
Net income (loss), diluted (in dollar per share) | $ (0.91) | $ 1.65 | $ 1.67 | $ 0.86 | $ 1.30 | $ 1.40 | $ 1.26 | $ 1.04 | $ 3.27 | $ 4.98 | $ 5.10
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to parent |  |  |  |  |  |  |  |  | $ 6,600 |  |
Net income (loss), diluted (in dollar per share) |  |  |  |  |  |  |  |  | $ 0.14 |  |

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