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Equity - Common Stock Dividends (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]                              
Quarterly dividend of common stock declared (in dollars per share) $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.1375 $ 0.55 $ 0.55 $ 0.55
Annualized dividend rate (in dollars per share) $ 0.55                       $ 0.55    
Ordinary dividends                         13.83% 60.00% 95.00%
Nondividend distributions                         86.17% 37.00% 0.00%
Capital gain distributions                         0.00% 3.00% 5.00%
Total                         100.00% 100.00% 100.00%