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Contingencies (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) shares	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	$ 1,835,000
Product warranty accruals and adjustments		920,000
Settlements		(613,000)
Balance as of September 30, 2020		$ 2,142,000
Loss Contingencies
Related party tax agreement percent of savings		85.00%
Due to Related Parties		$ 58,600,000	$ 89,900,000	$ 86,500,000
due to related party		16,115,000	27,857,000
Long-term debt - affiliate		$ 42,479,000	$ 62,014,000
Increase (Decrease) in Due to Related Parties	$ 3,300,000
Award vesting rights, percentage		100.00%
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		$ 70,000,000
Profit Units [Member] | Long-term Incentive Plan [Member]
Loss Contingencies
Number of shares authorized | shares		30,000
Outstanding Voting Power percentage		0.70
Outstanding Voting Power Percentage Minimum		0.30
Threshold Value		$ 855,000,000

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