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Certain Balance Sheet Components (Schedule of Timber and Timberlands) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Timber And Timberlands [Abstract]    
Timber and timberlands $ 585,315 $ 572,273
Logging roads 72,231 69,583
Total timber and timberlands, net $ 657,546 $ 641,856