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Fair value measurement (Tables) | 9 Months Ended
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Sep. 25, 2016
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis | The following tables provide information regarding the Company's financial assets and liabilities that are measured at fair value on a recurring basis as of September 25, 2016 and December 31, 2015:
| Total carrying value at September 25, 2016 |  | Quoted prices in active markets (Level 1) |  | Significant other observable Inputs (Level 2) |  | Significant unobservable Inputs (Level 3)
| (Dollars in thousands)
Investments in marketable securities | $ | 7,411 |  |  | $ | 7,411 |  |  | $ | — |  |  | $ | — |
Derivative assets | 1,134 |  |  | — |  |  | 1,134 |  |  | — |
Derivative liabilities | 2,403 |  |  | — |  |  | 2,403 |  |  | — |
Contingent consideration liabilities | 22,368 |  |  | — |  |  | — |  |  | 22,368 |
| Total carrying value at December 31, 2015 |  | Quoted prices in active markets (Level 1) |  | Significant other observable Inputs (Level 2) |  | Significant unobservable Inputs (Level 3)
| (Dollars in thousands)
Investments in marketable securities | $ | 6,922 |  |  | $ | 6,922 |  |  | $ | — |  |  | $ | — |
Derivative assets | 329 |  |  | — |  |  | 329 |  |  | — |
Derivative liabilities | 1,298 |  |  | — |  |  | 1,298 |  |  | — |
Contingent consideration liabilities | 20,829 |  |  | — |  |  | — |  |  | 20,829 |
Reconciliation of Changes in Level 3 Financial Liabilities Measured at Fair Value on Recurring Basis | The following table provides information regarding changes, during the nine months ended September 25, 2016, in Level 3 financial liabilities related to contingent consideration, which are described below in this Note 9 under "valuation techniques":
| Contingent consideration
| 2016
| (Dollars in thousands)
Balance - December 31, 2015 | $ | 20,829 |
Payment | (133 | )
Revaluations | 1,672 |
Balance - September 25, 2016 | $ | 22,368 |
Valuation Technique and Inputs Used to Determine Fair Value of Assets or Liabilities | The following table provides information regarding the valuation techniques and inputs used in determining the fair value of assets or liabilities categorized as Level 3 measurements as of September 25, 2016:
| Valuation Technique |  | Unobservable Input |  | Range (Weighted Average)
Contingent consideration | Discounted cash flow |  | Discount rate |  | 2.3% - 10% (8.4%)
Contingent consideration |  |  | Probability of payment |  | 2% - 100% (71.3%)

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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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