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Stockholders' Equity (Schedule of Dividend Increases) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 18, 2019
Apr. 30, 2018
Mar. 31, 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   17.00%    
Quarterly Common Stock Cash Dividend   $ 0.54    
Annual Common Stock Cash Dividend   $ 2.16    
Subsequent Event [Member]        
Class of Stock [Line Items]        
Common Stock, Dividends, Per Share, Declared $ 0.62      
Dividends, Common Stock, Cash $ 78