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Merger with Deltic (Summary of Unaudited Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Business Combinations [Abstract]    
Net sales $ 268,233 $ 506,793
Net earnings attributable to PotlatchDeltic common shareholders $ 47,225 $ 80,928
Basic earnings per share attributable to PotlatchDeltic common shareholders $ 0.71 $ 1.22
Diluted earnings per share attributable to PotlatchDeltic common shareholders $ 0.71 $ 1.21