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Contingencies (Details)
6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease)        
Balance as of December 31, 2019 $ 1,835,000      
Product warranty accruals and adjustments (57,000)      
Settlements (176,000)      
Balance as of June 30, 2020 $ 1,602,000      
Loss Contingencies        
RelatedPartyTaxAgreementPercentOfSavings 85.00%      
Due to Related Parties $ 58,700,000   $ 89,900,000 $ 86,500,000
due to related party 16,168,000   27,857,000  
Long-term debt - affiliate $ 42,479,000   $ 62,014,000  
Increase (Decrease) in Due to Related Parties   $ 3,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 80.00%      
SharebasedCompensationArrangementBySharebasedPaymentAwardAwardExpectedVestingRightsPercentage 1      
LIBO        
Loss Contingencies        
Due to Related Party, Basis Spread on Variable Rate 0.0100      
Minimum        
Loss Contingencies        
Potential loss liability $ 55,000,000      
Maximum        
Loss Contingencies        
Potential loss liability $ 75,000,000      
Profit Units [Member] | Long-term Incentive Plan [Member]        
Loss Contingencies        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares 30,000      
Threshold Value $ 855,000,000      
Outstanding Voting Power percentage 0.70      
Outstanding Voting Power Percentage Minimum 0.30