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Distributions Paid and Payable - Common Stock (Details) - $ / shares
1 Months Ended 9 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Jul. 31, 2018
Jun. 30, 2018
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Jan. 31, 2018
Sep. 30, 2017
Aug. 31, 2017
Jul. 31, 2017
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Mar. 31, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Distributions Paid and Payable                                        
Monthly distributions payable (in dollars per share) $ 0.2205                                   $ 0.2205  
Common stock                                        
Distributions Paid and Payable                                        
Total common stock dividends paid per share (in dollars per share) $ 0.2200 $ 0.2200 $ 0.2200 $ 0.2195 $ 0.2195 $ 0.2195 $ 0.2190 $ 0.2190 $ 0.2125 $ 0.2115 $ 0.2115 $ 0.2115 $ 0.2110 $ 0.2110 $ 0.2110 $ 0.2105 $ 0.2105 $ 0.2025 $ 1.9690 $ 1.8910