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Fair value measurement (Tables) | 12 Months Ended
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Dec. 31, 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 measured at fair value on a recurring basis as of December 31, 2016 and 2015:
| Total carrying value at December 31, 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 | $ | 7,660 |  |  | $ | 7,660 |  |  | $ | — |  |  | $ | — |
Derivative assets | 1,157 |  |  | — |  |  | 1,157 |  |  | — |
Derivative liabilities | 2,257 |  |  | — |  |  | 2,257 |  |  | — |
Contingent consideration liabilities | 7,102 |  |  | — |  |  | — |  |  | 7,102 |
| 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 in the Company's contingent consideration liabilities for the years ended December 31, 2016 and 2015:
| Contingent consideration
| 2016 |  | 2015
| (Dollars in thousands)
Beginning balance – January 1 | $ | 20,829 |  |  | $ | 33,433 |
Payment | (7,282 | ) |  | (8,054 | )
Revaluations | (6,445 | ) |  | (4,550 | )
Ending balance – December 31 | $ | 7,102 |  |  | $ | 20,829 |

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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=66048111&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=66048111&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=66048111&loc=d3e19190-110258 + Details
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