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Equity Additional (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2021 | May 05, 2021 | Feb. 25, 2021 | May 07, 2020 | Mar. 05, 2020 | Sep. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  |  | $ 29,184 | $ 26,763 | $ 58,316 | $ 53,877
Issuance of shares for acquisition of business |  |  |  |  |  |  |  |  | $ 0 | $ 113,841
Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.035 | $ 0.035 | $ 0.035 | $ 0.035 |  |  |  | $ 0.070 | $ 0.070
Common Class B |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.035 | $ 0.035 | $ 0 | $ 0 |  |  |  | $ 0.070 | $ 0
Number of shares issued in transaction (in shares) |  |  |  |  |  | 54,744,525 |  |  |  |
Consideration received on transaction |  |  |  |  |  | $ 450,000 |  |  |  |
Dividend Declared [Member] | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  | $ 27,268 | $ 27,220 | $ 26,767 | $ 27,117 |  |  |  | $ 54,488 | $ 53,884
Dividend Declared [Member] | Common Class B |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  | $ 1,916 |  | $ 0 | $ 0 |  |  |  | $ 3,832 | $ 0
Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.035 |  |  |  |  |  |  |  |  |

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