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Fair value measurement - Assets and Liabilities (Details) - Recurring - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents $ 132,496 $ 221,626
Total assets 132,496 221,626
Liabilities, Fair Value Disclosure [Abstract]    
Contingent consideration 1,838 2,926
Total liabilities 1,900 3,763
Related party    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 51 578
Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 11 259
Fair value hierarchy Level 1    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 132,496 221,626
Total assets 132,496 221,626
Fair value hierarchy Level 3    
Liabilities, Fair Value Disclosure [Abstract]    
Contingent consideration 1,838 2,926
Total liabilities 1,900 3,763
Fair value hierarchy Level 3 | Related party    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 51 578
Fair value hierarchy Level 3 | Long-term Debt [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments $ 11 $ 259