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Shareholders' Equity - Dividends (Details) - $ / shares
Nov. 01, 2017
Jun. 15, 2017
May 02, 2017
Dec. 15, 2016
Nov. 02, 2016
Jun. 15, 2016
May 03, 2016
Dividends [Abstract]              
Dividends declared (in dollars per share)     $ 0.93   $ 0.86   $ 0.86
Dividends paid (in dollars per share)   $ 0.93   $ 0.86   $ 0.86  
Subsequent Event              
Dividends [Abstract]              
Dividends declared (in dollars per share) $ 0.93