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Fair value measurement - Assets and Liabilities (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents $ 120,271 $ 132,496
Total assets 120,271 132,496
Liabilities, Fair Value Disclosure [Abstract]    
Contingent consideration 1,989 1,838
Total liabilities 2,023 1,900
Related party    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 32 51
Debt    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 2 11
Fair value hierarchy Level 1    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 120,271 132,496
Total assets 120,271 132,496
Fair value hierarchy Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Contingent consideration 1,989 1,838
Total liabilities 2,023 1,900
Fair value hierarchy Level 3 | Related party    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 32 51
Fair value hierarchy Level 3 | Debt    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments $ 2 $ 11