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Fair value of financial instruments - Reconciliation of Level 3 Fair Valued Instruments (Details) - Deferred Consideration - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 1,120 $ 1,180 $ 1,836
Total (gains) losses included in earnings (or change in net assets) 5 675 (26)
Settlements (1,125) (735) (630)
Ending balance $ 0 $ 1,120 $ 1,180