Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Apr. 06, 2020	Mar. 15, 2018	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Payment of litigation settlement					$ 4,833	$ 33,725
Accrual for Legal Matters and Settlements - Current					62,786		$ 67,471
Antidumping Duties [Member]
Loss Contingencies [Line Items]
Loss Contingency Multilayered Hardwood Products Purchase Percentage							6.00%	7.00%
Antidumping Duties [Member] | Other Expense [Member]
Loss Contingencies [Line Items]
Net interest expense					100
Litigation Relating to Formaldehyde Abrasion MDL's [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 36,000
Accrual for Legal Matters and Settlements Long-term					$ 100
Estimated period for final ruling (in years)					3 years
Escrow Deposit		22,000
Amount receive back from escrow agent		21,500
Book value of escrow deposit					$ 21,500
Litigation Settlement, Expense						$ 400
Litigation Relating to Formaldehyde Abrasion MDL's [Member] | Selling, General, and Administrative Expense [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense									$ 36,000
Litigation Relating to Bamboo Flooring
Loss Contingencies [Line Items]
Payment of litigation settlement							$ 1,000
Percent of floor damage submit as proof			7.00%
Litigation Relating to Bamboo Flooring | Other Current Liabilities [Member]
Loss Contingencies [Line Items]
Accrual for Legal Matters and Settlements - Current					$ 27,000
Litigation Relating to Bamboo Flooring | Selling, General, and Administrative Expense [Member]
Loss Contingencies [Line Items]
Accrued expenses				$ 28,000
Kramer Litigation Matters [Member]
Loss Contingencies [Line Items]
Payment of litigation settlement	$ 4,750
Cash and or Common Stock [Member] | Litigation Relating to Formaldehyde Abrasion MDL's [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount		22,000
In Store Credit [Member] | Litigation Relating to Formaldehyde Abrasion MDL's [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount		$ 14,000	$ 14,000
In Store Credit [Member] | Litigation Relating to Bamboo Flooring
Loss Contingencies [Line Items]
Litigation Settlement, Amount			14,000
Loss Contingency, Damages Awarded, Value			2,000
Maximum [Member] | Litigation Relating to Bamboo Flooring
Loss Contingencies [Line Items]
Litigation Settlement, Amount			$ 30,000