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Fair value measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 12,274 |
Expense included in earnings |  |  | 1,917 |
Settlements |  |  | (2,234) |
Balance, end of period | $ 11,957 |  | 11,957 |
RSDL [Member] |  |  |  |
Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Change in fair value of contingent obligations | $ 200 | $ 900 | $ 1,800 | $ 1,400

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