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Subsequent Events (Details) - Common Stock - Class A - $ / shares
3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Subsequent Event [Line Items]                  
Dividends declared per share   $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.025 $ 0.075 $ 0.075
Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Dividends declared per share $ 0.025