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Earnings Per Share and Certain Related Information - Dividends (Details) - $ / shares
Jun. 14, 2019
Mar. 15, 2019
Jan. 17, 2019
Oct. 26, 2018
Sep. 11, 2018
Aug. 31, 2018
Jul. 19, 2018
Jun. 15, 2018
May 03, 2018
Mar. 16, 2018
Jan. 18, 2018
Nov. 10, 2017
Sep. 27, 2017
Subsequent Event [Line Items]                          
Dividends declared (in dollars per share)     $ 0.17   $ 0.15   $ 0.15   $ 0.15   $ 0.15   $ 0.15
Dividends paid (in dollars per share)   $ 0.17   $ 0.15   $ 0.15   $ 0.15   $ 0.15   $ 0.15  
Scenario, Forecast                          
Subsequent Event [Line Items]                          
Dividends paid (in dollars per share) $ 0.17