Property, Plant and Equipment (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Depreciation expense	$ 37,600,000	$ 30,600,000	$ 25,200,000
Ola, Arkansas Sawmill [Member]
Property Plant And Equipment [Line Items]
Deductible amount of property damage and business interruption losses	2,000,000.0
Business interruption recoveries	26,200,000	0
Property damage recoveries	8,800,000
Proceeds from insurance recoveries for property damage		15,000,000.0
Insurance recoveries	35,000,000	$ 15,000,000
Waldo Arkansas Sawmill [Member]
Property Plant And Equipment [Line Items]
Expected expansion and modernization cost	131,000,000.0
Project expansion and modernization cost	12,200,000
Additional depreciation expense	$ 7,000,000.0