Segment Information (Reconciliation of Business Segment Total Assets to Total Assets) (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Asset Reconciling Item [Line Items]
Assets		$ 2,258,941	$ 2,325,852
Operating Segments [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets		2,153,655	2,242,676
Operating Segments [Member] | Timberlands [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	[1]	1,680,766	1,693,162
Operating Segments [Member] | Wood Products [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets		379,370	456,306
Operating Segments [Member] | Real Estate Segment [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets	[2]	93,519	93,208
Corporate [Member]
Segment Reporting Asset Reconciling Item [Line Items]
Assets		$ 105,286	$ 83,176

[1] We do not report rural real estate separate from Timberlands as we do not report these assets separately to management.

[2] Real Estate assets primarily consist of real estate development acquired with the Deltic merger.