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Changes in Capital Structure Changes in Capital Structure - Dividends (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
[1]
Sep. 30, 2017
Sep. 30, 2016
[1]
Dec. 31, 2016
Class of Stock [Line Items]              
Dividends Per Common Share, Cash Paid $ 0.28 $ 0.27 $ 0.26        
Dividends Payable, Date Declared         Oct. 31, 2017    
Common Stock, Dividends, Per Share, Declared         $ 0.288    
Dividends Payable, Date to be Paid         Dec. 15, 2017    
Dividends Payable, Date of Record         Dec. 01, 2017    
Preferred Stock, Shares Authorized 10,000,000       10,000,000   10,000,000
Preferred Stock, Par or Stated Value Per Share $ 0.01       $ 0.01    
Common Class A [Member]              
Class of Stock [Line Items]              
Dividends Per Common Share, Cash Paid 0.28     $ 0.24 0.81 $ 0.70  
Common Class C [Member]              
Class of Stock [Line Items]              
Dividends Per Common Share, Cash Paid $ 0.28     $ 0.24 $ 0.81 $ 0.70  
[1] (a) Retrospectively adjusted as discussed in Note 1, Nature of Business.