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Subsequent Events (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 10, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]          
Dividends declared per share (in US dollars per share)   $ 0.47 $ 0.43 $ 0.94 $ 0.87
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared per share (in US dollars per share) $ 0.47