Timberland Acquisitions - Summary of Timberland Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 acre	Dec. 31, 2013 acre
Significant Acquisitions and Disposals [Line Items]
Cost	$ 130,896	$ 20,401
Acres	62,344	17,094,000
Alabama [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	41,453	0
Acres	18,113	0
Florida [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	22,157	1,198
Acres	15,774	640,000
Georgia [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	46,525	10,215
Acres	16,573	9,036,000
Louisiana [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	0	8,894
Acres	0	7,418,000
Texas [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	17,960	94	[1]
Acres	10,900	0
Washington [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	1,878	0
Acres	438	0
New Zealand [Member]
Significant Acquisitions and Disposals [Line Items]
Cost	$ 923	$ 0
Acres	546	0

[1] Represents funds expended in early 2013 for an acquisition in late 2012.