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Goodwill (Additional Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 94,697,000 $ 94,697,000  
Goodwill, Impairment Loss, Net of Tax 0    
Goodwill, Impaired, Accumulated Impairment Loss $ 3,600,000 $ 3,600,000 $ 3,600,000