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Stockholders' Equity Matters - Dividends Declared (Details)
1 Months Ended 3 Months Ended
Apr. 02, 2019
USD ($)
Feb. 07, 2019
$ / shares
Oct. 02, 2018
USD ($)
Jul. 24, 2018
$ / shares
Jul. 02, 2018
USD ($)
May 24, 2018
$ / shares
Apr. 02, 2018
USD ($)
Feb. 14, 2018
$ / shares
Dec. 15, 2015
USD ($)
Oct. 29, 2015
$ / shares
Oct. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Subsidiary or Equity Method Investee [Line Items]                            
Dividends Declared per Common Share (in dollars per share) | $ / shares   $ 0.6110   $ 0.5875   $ 0.5875   $ 0.5875   $ 0.6110        
Dividends, Common Stock     $ 168,148,000   $ 168,078,000   $ 167,969,000   $ 174,935,000     $ 176,460,000 $ 169,044,000  
Common stock, issued shares | shares                       286,829,854   286,321,009
Common Stock, Par or Stated Value Per Share | $ / shares                       $ 0.01   $ 0.01
Subsequent Event                            
Subsidiary or Equity Method Investee [Line Items]                            
Dividends, Common Stock $ 175,242,000                          
At The Market (ATM) Equity Program [Member]                            
Subsidiary or Equity Method Investee [Line Items]                            
Sale of Stock, Authorized Amount                     $ 500,000,000      
Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution                       $ 431,200,000    
Number Of Banks                     10      
Sale of Stock, Number of Shares Issued in Transaction | shares                       0