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Changes in shareholders' equity - Reconciliation of basic to diluted weighted average common shares outstanding (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 25, 2016 | Sep. 27, 2015 | Sep. 25, 2016 | Sep. 27, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Basic (in shares) | 44,045 | 41,597 | 43,081 | 41,542 |
Dilutive effect of share-based awards (in shares) | 639 | 511 | 574 | 483 |
Dilutive effect of 3.875% Convertible Notes and warrants (in shares) | 2,762 | 6,424 | 4,169 | 5,944 |
Diluted (in shares) | 47,446 | 48,532 | 47,824 | 47,969 |
Senior Notes | 3.875% Convertible Senior Subordinated Notes due 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, stated interest rate | 3.875% | 3.875% | 3.875% | 3.875% | 3.875%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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