XML 95 R58.htm IDEA: XBRL DOCUMENT v3.20.1
Goodwill (Summary of Changes in Goodwill) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]        
Goodwill, beginning balance   $ 10,039,000    
Impairments $ (10,000,000.0) (10,039,000) $ 0 $ 0
Goodwill, ending balance   $ 0 $ 10,039,000