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Capital Stock - Schedule of Dividends Payable (Details) - $ / shares
Jan. 12, 2017
Oct. 12, 2016
Jul. 12, 2016
Apr. 12, 2016
Jan. 12, 2016
Oct. 13, 2015
Jul. 14, 2015
Apr. 10, 2015
Dividends Payable [Line Items]                
Payment Date   Oct. 12, 2016 Jul. 12, 2016 Apr. 12, 2016 Jan. 12, 2016 Oct. 13, 2015 Jul. 14, 2015 Apr. 10, 2015
Record Date   Sep. 30, 2016 Jun. 30, 2016 Mar. 31, 2016 Dec. 31, 2015 Sep. 30, 2015 Jun. 30, 2015 Mar. 31, 2015
Dividends per common share (in dollars per share)   $ 0.1250 $ 0.1250 $ 0.125 $ 0.125 $ 0.1250 $ 0.1250 $ 0.125
Subsequent Event                
Dividends Payable [Line Items]                
Payment Date Jan. 12, 2017              
Record Date Dec. 30, 2016              
Dividends per common share (in dollars per share) $ 0.125