Nature of Business Operations (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2011 a	Dec. 31, 2017 USD ($) a segment core_business_area $ / shares	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($)	Mar. 31, 2016	Mar. 03, 2016	Apr. 30, 2013	Apr. 04, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Par value (dollars per share) | $ / shares		$ 0
Timberland owned or leased (acres)		2,600,000
Number of reportable business segments | segment		5
Additional interest acquired (as a percent)								39.00%
Ownership interest (as a percent)					77.00%	77.00%	65.00%	65.00%
Timberlands acquired (acres)	250,000	109,533	110,727
Payments to acquire timberlands | $		$ 242,910	$ 366,481	$ 98,409
Savannah, Georgia to Daytona Beach, Florida
Revenues from External Customers and Long-Lived Assets [Line Items]
Timberland owned or leased (acres)		200,000
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Timberlands acquired (acres)		7,546	0
Payments to acquire timberlands | $		$ 21,376	$ 0
Florida, Georgia, South Carolina, Washington and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Timberlands acquired (acres)		109,000
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Timberlands acquired (acres)			111,000
Payments to acquire timberlands | $			$ 366,500
New Zealand JV
Revenues from External Customers and Long-Lived Assets [Line Items]
Additional interest acquired (as a percent)						12.00%
New Zealand JV | New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Timberland owned or leased (acres)		410,000
Net plantable acres (acres)		293,000
Trading business
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of core areas of business | core_business_area		2