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Mergers and Divestitures (Summary of Unaudited Pro Forma Information) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Business Combinations [Abstract]  
Net sales | $ $ 1,013,242
Net earnings attributable to PotlatchDeltic common shareholders | $ $ 145,685
Basic earnings per share attributable to PotlatchDeltic common shareholders | $ / shares $ 2.16
Diluted earnings per share attributable to PotlatchDeltic common shareholders | $ / shares $ 2.15