Timber and Timberlands (Schedule of Timber and Timberlands) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Timber And Timberlands [Abstract]
Timber and timberlands	$ 1,554,882	$ 1,590,997
Logging roads	83,781	81,818
Total timber and timberlands, net	$ 1,638,663	$ 1,672,815