Timber and Timberlands (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Timber And Timberlands [Abstract]
Depletion from Company Owned Lands	$ 41.7	$ 43.9	$ 17.0
Amortization of Logging Roads	3.6	$ 3.4	$ 3.2
Future payments due under timber cutting contracts	$ 21.8