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Stockholders' Equity Matters - Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 15, 2021
May 06, 2021
Mar. 15, 2021
Feb. 24, 2021
Dec. 15, 2020
Nov. 04, 2020
Sep. 15, 2020
Aug. 05, 2020
Jun. 15, 2020
May 05, 2020
Mar. 16, 2020
Feb. 13, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Aug. 05, 2021
Equity [Abstract]                                  
DIVIDEND PER SHARE (in dollars per share)   $ 0.6185   $ 0.6185   $ 0.6185   $ 0.6185   $ 0.6185   $ 0.6185          
TOTAL AMOUNT $ 179,026   $ 178,569   $ 178,290   $ 178,224   $ 178,212   $ 178,047   $ 180,760 $ 179,342 $ 359,445 $ 358,854  
Subsequent Event                                  
Dividends Payable [Line Items]                                  
Dividends declared (in dollars per share)                                 $ 0.6185