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Summary of Significant Accounting Policies (Supplemental Disclosures to Consolidated Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NONCASH INVESTING AND FINANCING ACTIVITIES      
Long-term debt assumed by buyer in sale of facility   $ 29,000  
Accrued property, plant and equipment additions $ 1,142 1,396 $ 339
Accrued timberlands reforestation and roads 697 352 199
Equity issued as consideration for our merger with Deltic     1,142,775
Earnings and profits distribution     177,565
CASH FLOW INFORMATION      
Interest, net of amounts capitalized 28,518 32,282 34,490
Income taxes, net $ 25,790 $ 7,148 $ 10,800