Timberland Acquisitions - Summary of Timberland Acquisitions (Details) $ in Thousands		1 Months Ended	12 Months Ended
	May 10, 2016 USD ($) a	Nov. 30, 2011 a	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Cost | $	$ 263,000		$ 366,481	$ 98,409	$ 130,896
Acres | a	61,000	250,000	110,727	36,750
Florida
Business Acquisition [Line Items]
Cost | $			$ 14,323	$ 5,031
Acres | a			6,937	3,428
Georgia
Business Acquisition [Line Items]
Cost | $			$ 12,485	$ 1,495
Acres | a			5,427	1,443
Louisiana
Business Acquisition [Line Items]
Cost | $			$ 0	$ 47,840
Acres | a			0	24,494
Mississippi
Business Acquisition [Line Items]
Cost | $			$ 0	$ 42
Acres | a			0	40
Oregon
Business Acquisition [Line Items]
Cost | $			$ 239,896	$ 34,052
Acres | a			55,603	5,578
Texas
Business Acquisition [Line Items]
Cost | $			$ 77,139	$ 0
Acres | a			37,513	0
Washington
Business Acquisition [Line Items]
Cost | $			$ 22,638	$ 0
Acres | a			5,247	0
New Zealand
Business Acquisition [Line Items]
Cost | $			$ 0	$ 9,949
Acres | a			0	1,767