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Fair value measurement (Tables) | 9 Months Ended
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Sep. 30, 2018
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 30, 2018 and December 31, 2017:
| Total carrying value at September 30, 2018 |  | 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 | $ | 9,849 |  |  | $ | 9,849 |  |  | $ | — |  |  | $ | — |
Derivative assets | 2,333 |  |  | — |  |  | 2,333 |  |  | — |
Derivative liabilities | 1,636 |  |  | — |  |  | 1,636 |  |  | — |
Contingent consideration liabilities | 244,574 |  |  | — |  |  | — |  |  | 244,574 |
| Total carrying value at December 31, 2017 |  | 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 | $ | 9,045 |  |  | $ | 9,045 |  |  | $ | — |  |  | $ | — |
Derivative assets | 1,221 |  |  | — |  |  | 1,221 |  |  | — |
Derivative liabilities | 1,426 |  |  | — |  |  | 1,426 |  |  | — |
Contingent consideration liabilities | 272,136 |  |  | — |  |  | — |  |  | 272,136 |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | The table below provides additional information regarding the valuation technique and inputs used in determining the fair value of contingent consideration recognized in connection with the NeoTract acquisition.
| Valuation Technique |  | Unobservable Input |  | Range
Contingent consideration | Monte Carlo simulation |  | Revenue volatility |  | 24.1 | %
|  |  | Risk free rate |  | Cost of debt structure |
|  |  | Projected year of payment |  | 2019 - 2021 |
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 30, 2018, in Level 3 financial liabilities related to contingent consideration:
| Contingent consideration
| 2018
| (Dollars in thousands)
Balance - December 31, 2017 | $ | 272,136 |
Additions (1) | 396 |
Payments (2) | (75,252 | )
Revaluations | 47,344 |
Translation adjustment | (50 | )
Balance - September 30, 2018 | $ | 244,574 |
(1) The Company established a liability related to the estimated fair value of contingent consideration associated with the acquired assets from QT Vascular. (2) Consists mainly of a $75.0 million payment resulting from the achievement of a sales goal associated with the NeoTract acquisition for the period from January 1, 2018 to April 30, 2018.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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