Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Timber and timberlands, seeds and seedlings	$ 5,500	$ 4,800
HBU real estate not expected to be sold within next 12 months	65,400	77,400
Real estate development investments	2,676	3,674	$ 1,292
Silvicultural expenditures on higher and better use property	$ 300	$ 200