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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair value measurements [Abstract] |
Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) | The following table is a reconciliation of the beginning and ending balance of the liabilities measured at fair value using significant unobservable inputs (Level 3) during the years ended December 31, 2017 and 2016.
(in thousands) |  |  |
Balance at December 31, 2015 |  | $ | 25,155 |
(Income) expense included in earnings |  |  | (10,857 | )
Settlements |  |  | (1,113 | )
Balance at December 31, 2016 |  | $ | 13,185 |
(Income) expense included in earnings |  |  | 7,830 |
Settlements |  |  | (10,941 | )
Purchases, sales and issuances |  |  | 2,200 |
Balance at December 31, 2017 |  | $ | 12,274 |

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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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