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Merger with Deltic (Summary of Estimated Fair Value Measurements of Assets Acquired and Liabilities Assumed) (Details)
$ in Thousands
Feb. 20, 2018
USD ($)
ASSETS  
Cash and cash equivalents $ 3,419
Customer receivables 12,709
Inventories 17,316
Other current assets 5,285
Real estate held for development and sale 83,000
Property, plant and equipment 260,769
Timber and timberlands 1,055,745
Mineral rights 6,236
Trade name and customer relationships intangibles 19,500
Other long-term assets 3,556
Total assets acquired 1,467,535
LIABILITIES  
Accounts payable and accrued liabilities 12,615
Long-term debt 230,112
Pension and other postretirement employee benefits 36,909
Deferred tax liabilities, net 44,188
Other long-term liabilities 936
Total liabilities assumed 324,760
Net assets acquired 1,142,775
Previously Reported [Member]  
ASSETS  
Cash and cash equivalents 3,419
Customer receivables 12,709
Inventories 17,316
Other current assets 8,276
Real estate held for development and sale 79,000
Property, plant and equipment 265,901
Timber and timberlands 1,060,000
Trade name and customer relationships intangibles 19,000
Other long-term assets 2,010
Total assets acquired 1,467,631
LIABILITIES  
Accounts payable and accrued liabilities 12,604
Long-term debt 229,968
Pension and other postretirement employee benefits 36,909
Deferred tax liabilities, net 44,439
Other long-term liabilities 936
Total liabilities assumed 324,856
Net assets acquired 1,142,775
Measurement Period Adjustment [Member]  
ASSETS  
Other current assets (2,991)
Real estate held for development and sale 4,000
Property, plant and equipment (5,132)
Timber and timberlands (4,255)
Mineral rights 6,236
Trade name and customer relationships intangibles 500
Other long-term assets 1,546
Total assets acquired (96)
LIABILITIES  
Accounts payable and accrued liabilities 11
Long-term debt 144
Deferred tax liabilities, net (251)
Total liabilities assumed $ (96)