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Summary of Significant Accounting Policies Goodwill (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]      
Number of Reporting Units 2    
Goodwill, Impairment Loss $ 2,403,000 $ 0 $ 0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 23.00%