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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Percent distribution of REIT taxable income 100.00%    
Income provision $ 0    
Number of years subsequent to a failed REIT Qualifying Test the Company would not be Qualified as a REIT 4 years    
Uncertain tax positions $ 0    
Penalties and interest 0 $ 0 $ 0
Penalties and interest accrued 0 0  
Federal income tax basis 7,100,000,000 $ 6,800,000,000  
Taxable REIT Subsidiary      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 20,800,000    
Valuation allowance $ 20,800,000    
Cash | Tax Year 2018 | Tax Cuts and Jobs Act | Taxable REIT Subsidiary      
Income Tax Contingency [Line Items]      
Effective income tax rate for repatriation of foreign earnings 15.50%    
Noncash | Tax Year 2018 | Tax Cuts and Jobs Act | Taxable REIT Subsidiary      
Income Tax Contingency [Line Items]      
Effective income tax rate for repatriation of foreign earnings 8.00%