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Stockholders' Equity (Schedule of Dividend Increases) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Jul. 15, 2019
Apr. 30, 2019
Apr. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Class of Stock [Line Items]          
Common Stock, Par or Stated Value Per Share       $ 0.0001 $ 0.0001
Common stock, dividends, rate increase, percent   15.00% 17.00%    
Quarterly Common Stock Cash Dividend   $ 0.62 $ 0.54    
Annual Common Stock Cash Dividend   $ 2.48 $ 2.16    
Subsequent Event [Member]          
Class of Stock [Line Items]          
Common Stock, Dividends, Per Share, Declared $ 0.62        
Dividends, Common Stock, Cash $ 77