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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Feb. 05, 2020
Jan. 06, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]                          
Repayment on mortgage loans payable                     $ 1,514 $ 19,201 $ 1,916
Dividend, common stock, declared (in dollars per share)     $ 0.27 $ 0.27 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.22 $ 0.22      
Subsequent event [Member]                          
Subsequent Event [Line Items]                          
Dividend, common stock, declared (in dollars per share) $ 0.27                        
Subsequent event [Member] | Mortgage loans payable [Member]                          
Subsequent Event [Line Items]                          
Repayment on mortgage loans payable   $ 32,700                      
Debt instrument, interest rate   3.65%