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Segment Information (Summary of Revenues by Major Product) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]      
Revenues $ 1,040,930 $ 827,098 $ 974,579
Operating Segments [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 1,179,340 941,973 1,090,447
Intersegment Eliminations [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues [1] (138,410) (114,875) (115,868)
Timberlands [Member] | Operating Segments [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 376,519 322,693 354,950
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 219,429 169,416 213,950
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Sawlogs [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 213,030 161,570 205,977
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Pulpwood [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 4,502 5,767 5,996
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Stumpage [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 316 109 176
Timberlands [Member] | Operating Segments [Member] | Northern Region [Member] | Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 1,581 1,970 1,801
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 157,090 153,277 141,000
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Sawlogs [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 93,828 88,048 81,460
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Pulpwood [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 49,084 53,315 48,585
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Stumpage [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 4,077 1,666 2,434
Timberlands [Member] | Operating Segments [Member] | Southern Region [Member] | Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 10,101 10,248 8,521
Wood Products [Member] | Operating Segments [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 698,405 540,408 680,931
Wood Products [Member] | Operating Segments [Member] | Lumber [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 573,069 396,648 464,180
Wood Products [Member] | Operating Segments [Member] | Residuals and Panels [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 125,336 143,760 216,751
Real Estate Segment [Member] | Operating Segments [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 104,416 78,872 54,566
Real Estate Segment [Member] | Operating Segments [Member] | Rural Real Estate [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 81,979 49,675 36,024
Real Estate Segment [Member] | Operating Segments [Member] | Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 7,458 6,834 5,690
Real Estate Segment [Member] | Operating Segments [Member] | Development Real Estate [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues $ 14,979 $ 22,363 $ 12,852
[1] Intersegment revenues represent logs sold by our Timberlands segment to the Wood Products segment.