Segment and Geographical Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 166,146	$ 200,890	$ 245,906	$ 203,196	$ 239,722	$ 184,419	$ 200,964	$ 194,491	$ 816,138	$ 819,596	$ 815,915
Operating Income/(Loss)									170,068	215,491	255,777
Unallocated interest expense and other									(27,502)	(32,231)	(32,943)
INCOME BEFORE INCOME TAXES									142,566	183,260	222,834
Total capital expenditures									62,325	65,345	58,723
Payments to acquire timberlands									57,608	242,910	366,481
Total Gross Capital Expenditures									119,933	308,255	425,204
Spending on office building									0	6,084	6,307
Real estate development investments									9,501	15,784	8,746
Depreciation, Depletion and Amortization									144,121	146,001	151,146
Real Estate | Large Dispositions
Segment Reporting Information [Line Items]
Operating Income/(Loss)										67,000	143,900
Depreciation, Depletion and Amortization										18,400	36,100
Large Dispositions										9,800	22,200
Operating Segments | Southern Timber
Segment Reporting Information [Line Items]
Sales									169,995	144,510	151,192
Operating Income/(Loss)									44,245	42,254	43,098
Total capital expenditures									35,388	34,476	33,487
Payments to acquire timberlands									45,943	220,051	103,947
Depreciation, Depletion and Amortization									58,609	49,357	49,747
Operating Segments | Pacific Northwest Timber
Segment Reporting Information [Line Items]
Sales									109,832	91,877	77,802
Operating Income/(Loss)									8,137	1,127	(3,992)
Total capital expenditures									9,311	10,254	8,036
Payments to acquire timberlands									0	1,483	262,534
Depreciation, Depletion and Amortization									32,779	32,008	25,246
Operating Segments | New Zealand Timber
Segment Reporting Information [Line Items]
Sales									249,014	223,299	176,041
Operating Income/(Loss)									62,754	57,567	33,049
Total capital expenditures									17,318	17,046	16,095
Payments to acquire timberlands									11,665	21,376	0
Depreciation, Depletion and Amortization									28,007	27,499	23,447
Operating Segments | Real Estate
Segment Reporting Information [Line Items]
Sales									138,575	207,326	301,198
Operating Income/(Loss)									76,240	130,856	202,402
Total capital expenditures									284	1,348	315
Depreciation, Depletion and Amortization									23,566	36,343	52,304
Non-Cash Cost of Land and Improved Development									23,553	23,498	33,862
Operating Segments | Real Estate | Improved Development
Segment Reporting Information [Line Items]
Sales									8,393	6,348	1,740
Operating Segments | Real Estate | Unimproved Development
Segment Reporting Information [Line Items]
Sales									8,621	16,405	5,540
Operating Segments | Real Estate | Rural
Segment Reporting Information [Line Items]
Sales									22,689	18,632	18,672
Operating Segments | Real Estate | Non-Strategic / Timberlands
Segment Reporting Information [Line Items]
Sales									98,872	70,590	67,981
Operating Segments | Real Estate | Large Dispositions
Segment Reporting Information [Line Items]
Sales									0	95,351	207,265
Operating Segments | Trading
Segment Reporting Information [Line Items]
Sales									148,814	152,584	109,682
Operating Income/(Loss)									953	4,578	2,002
Corporate and other
Segment Reporting Information [Line Items]
Operating Income/(Loss)									(22,261)	(20,891)	(20,782)
Total capital expenditures									24	2,221	790
Depreciation, Depletion and Amortization									1,160	794	402
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales									$ (92)	$ 0	$ 0