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Income Taxes - Tax Status of Dividends (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Tax Status of Dividends [Line Items]      
Document Fiscal Year Focus 2018    
Ordinary income 98.00% 86.00% 53.00%
Capital gain 0.00% 10.00% 8.00%
Return of capital 0.00% 4.00% 39.00%
Allocation of Dividends, Qualified Dividend Income 2.00% 0.00% 0.00%
Allocation of Dividends, Section 199A Dividend 98.00% 0.00% 0.00%
Parent Company [Member]      
Schedule of Tax Status of Dividends [Line Items]      
Dividend per share $ 2.22 $ 2.10 $ 2.00