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Goodwill (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairment   $ 0 $ 0
Goodwill [Roll Forward]      
Goodwill, beginning of period   98,900,000 96,000,000
Effect of foreign currency translation $ (2,400,000)   2,900,000
Goodwill, end of period $ 96,500,000 $ 96,500,000 $ 98,900,000