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Stockholders' Equity Matters - Dividends Declared (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 02, 2019
USD ($)
May 22, 2019
$ / shares
Apr. 02, 2019
USD ($)
Feb. 07, 2019
$ / shares
Jan. 03, 2019
USD ($)
Oct. 25, 2018
$ / 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
Oct. 31, 2017
USD ($)
bank
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Subsidiary or Equity Method Investee [Line Items]                                  
Dividend Per Share (in dollars per share) | $ / shares   $ 0.6110   $ 0.6110   $ 0.6110   $ 0.5875   $ 0.5875   $ 0.5875          
Total Amount     $ 175,242   $ 174,935   $ 168,148   $ 168,078   $ 167,969     $ 176,642 $ 169,207 $ 353,102 $ 338,251
Subsequent Event                                  
Subsidiary or Equity Method Investee [Line Items]                                  
Total Amount $ 175,389                                
At The Market (ATM) Equity Program                                  
Subsidiary or Equity Method Investee [Line Items]                                  
Number of banks | bank                         10        
Aggregate sales price of common stock                         $ 500,000        
Shares of common stock sold (in shares) | shares                               0  
Remaining aggregate sale price of shares of common stock                           $ 431,200   $ 431,200