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Equity - Class of Stock Disclosures - Dividends and AOCI (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Jan. 31, 2018
Mar. 31, 2017
Feb. 28, 2017
Jan. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dividend Distributions                  
Paid               $ 22,578 $ 22,552
Dividends per share declared (in dollars per share)               $ 0.57 $ 0.57
Dividends paid per common share (in dollars per share)   $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.19 $ 0.57 $ 0.57
Common Stock                  
Dividend Distributions                  
Declared   $ 22,578     $ 22,552     $ 22,578 $ 22,552
Paid               $ 22,578 $ 22,552
Common Stock | Subsequent Event | Dividend Payable, April 30, 2018                  
Dividend Distributions                  
Dividends per share declared (in dollars per share) $ 0.19                
Common Stock | Subsequent Event | Dividend Payable, May 31, 2018                  
Dividend Distributions                  
Dividends per share declared (in dollars per share) 0.19                
Common Stock | Subsequent Event | Dividend Payable, June 29, 2018                  
Dividend Distributions                  
Dividends per share declared (in dollars per share) $ 0.19