Quarterly report pursuant to Section 13 or 15(d)

Equity Schedule of Common Dividends Declared (Details)

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Equity Schedule of Common Dividends Declared (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]              
Declaration Date Jun. 15, 2017 Mar. 14, 2017 Dec. 15, 2016 Sep. 15, 2016 Jun. 16, 2016    
Record Date Jun. 30, 2017 Mar. 31, 2017 Dec. 30, 2016 Sep. 30, 2016 Jun. 30, 2016    
Payment Date Jul. 27, 2017 Apr. 27, 2017 Jan. 27, 2017 Oct. 20, 2016 Jul. 20, 2016    
Dividends declared per common share (in usd per share) $ 0.26 $ 0.25 $ 0.24 $ 0.23 $ 0.23 $ 0.51 $ 0.46