Timberland Acquisitions (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2011 a	Dec. 31, 2015 USD ($) a acquisition	Dec. 31, 2014 USD ($) a acquisition
Business Acquisition [Line Items]
Acres acquired	250,000	36,750	62,344
Cost | $		$ 98,409	$ 130,896
Acres of timberland owned leased		2,700,000
Florida Georgia Louisianna Mississippi and Oregon
Business Acquisition [Line Items]
Number of timberland acquisition transactions | acquisition		8
Acres acquired		35,000
Cost | $		$ 88,500
New Zealand
Business Acquisition [Line Items]
Number of timberland acquisition transactions | acquisition		1	1
Acres acquired		1,767	546
Cost | $		$ 9,949	$ 923
Acres of timberland owned leased		1,800
Lease payments | $		$ 9,900
Alabama, Florida, Georgia, Texas and Washington Timberland Acquisitions
Business Acquisition [Line Items]
Number of timberland acquisition transactions | acquisition			12
Acres acquired			62,000
Cost | $			$ 130,000