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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairment, accumulated $ 0 $ 0  
Amortization of intangible assets 500,000 500,000 $ 500,000
Impairment of intangible assets $ 0 $ 0