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Financial Instruments and Fair Value Measurements - Held by Special Purpose Entities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Jun. 30, 2020
Dec. 31, 2019
Financial instruments and fair value measurements      
Investments held by special purpose entities   $ 206,438 $ 206,771
Senior Notes held by special purpose entity   177,156 $ 177,026
Panama City Timber Finance Company, LLC | 2014 real estate sale      
Financial instruments and fair value measurements      
Notes received as consideration in sale of real estate $ 200,000    
Promissory notes maturity period 15 years    
Panama City Timber Finance Company, LLC | Time deposit      
Financial instruments and fair value measurements      
Investments held by special purpose entities   $ 200,000  
Investment interest rate (as a percent)   4.00%  
Panama City Timber Finance Company, LLC | U.S. Treasury Bills      
Financial instruments and fair value measurements      
Investments held by special purpose entities   $ 6,000  
Panama City Timber Finance Company, LLC | Cash      
Financial instruments and fair value measurements      
Investments held by special purpose entities   400  
Northwest Florida Timber Finance, LLC      
Financial instruments and fair value measurements      
Loan amount $ 180,000    
Debt interest rate (as a percent) 4.80%    
Issue price of senior secured notes (as a percent) 98.50%    
Senior Notes held by special purpose entity   177,200  
Unamortized discount and debt issuance costs   $ 2,800