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Income Taxes and Distributions (Summary of Tax Effects of Taxable and Deductible Temporary Differences) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax effect of temporary differences        
Investments and property, primarily differences in investment basis, depreciation and amortization, the basis of land assets and the treatment of interests and certain costs $ (24,085) $ (13,064) $ (2,533)  
Operating loss and interest deduction carryforwards 196,634 127,525 98,713  
Expense accruals and other 72,459 43,056 48,804  
Valuation allowances (244,938) (159,057) (155,592) $ (127,283)
Net deferred tax assets (liabilities) $ 70      
Net deferred tax assets (liabilities)   $ (1,540) $ (10,608)