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Goodwill (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Impairments $ 10,000,000.0 $ 10,039,000 $ 0 $ 0