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Goodwill and Intangibles - Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill      
Balance at the beginning of the period $ 224,651,000 $ 149,928,000  
Acquisitions 0 81,016,000  
Divestitures (1,854,000) 0  
Reclassifications, adjustments and other 181,000 (3,033,000)  
Translation adjustments 14,325,000 (3,260,000)  
Balance at the end of the period 237,303,000 224,651,000 $ 149,928,000
Impairments $ 0 $ 0 $ 0