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Certain Balance Sheet Components (Schedule of Timber and Timberlands) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Timber And Timberlands [Abstract]    
Timber and timberlands $ 1,585,209 $ 1,590,997
Logging roads 80,959 81,818
Total timber and timberlands, net $ 1,666,168 $ 1,672,815