Certain Balance Sheet Components (Schedule of Timber and Timberlands) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Timber And Timberlands [Abstract]
Timber and timberlands	$ 1,505,150	$ 1,516,788
Logging roads	82,443	83,273
Total timber and timberlands, net	$ 1,587,593	$ 1,600,061