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Financial Statement Information Noncontrolling Interest (Details)
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Decrease from Deconsolidation [1] $ 11,404,000    
Redeemable noncontrolling interest 24,077,000 $ 24,077,000  
Redeemable NCI, Call Option   26,000,000 € 23,000,000
Reedemable NCI, Put Option   $ 24,000,000 € 21,000,000
Noncontrolling Interest      
Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Decrease from Deconsolidation [1] $ 11,404,000    
[1] (1) The amount disposed of in 2020 relates to discontinued operations. See Note 2, "Discontinued Operations," for further information.