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Business Combinations - Acquisition (Details) - USD ($)
$ in Thousands
6 Months Ended
May 15, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition        
Goodwill   $ 71,057   $ 71,057
Net cash paid   $ 0 $ 19,265  
Noliac A/S        
Business Acquisition        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 9,142      
Current assets 2,836      
Property, plant and equipment 580      
Other assets 395      
Goodwill 9,313      
Fair value of assets acquired 22,266      
Less fair value of liabilities acquired (3,145)      
Net cash paid $ 19,121