Certain Balance Sheet Components (Schedule of Ola Arkansas Sawmill Fire) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Insurance recoveries				$ 13,250
Net gain on insurance recoveries	$ 4,394			4,394
Ola, Arkansas Sawmill [Member]
Property, Plant and Equipment [Line Items]
Fixed asset write-offs	(7,436)	$ (2,100)		(9,544)
Disposal costs	(1,061)			(1,061)
Total fixed asset loss on disposal	(8,498)			(10,606)
Insurance recoveries	12,892		$ 2,100	15,000
Net gain on insurance recoveries	$ 4,394			$ 4,394