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Stockholders' Equity Matters - Classification of Dividends Paid (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Percent of dividends paid 100.00% 100.00% 100.00%
Nonqualified ordinary dividends      
Class of Stock [Line Items]      
Percent of dividends paid 83.00% 82.10% 45.50%
Qualified ordinary dividends      
Class of Stock [Line Items]      
Percent of dividends paid 4.80% 17.90% 21.00%
Capital gains      
Class of Stock [Line Items]      
Percent of dividends paid 5.80% 0.00% 0.00%
Return of capital      
Class of Stock [Line Items]      
Percent of dividends paid 6.40% 0.00% 33.50%