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Mergers and Divestitures (Summary of Unaudited Pro Forma Information) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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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

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