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Capital Stock, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 10, 2021 | Apr. 30, 2021 | Feb. 28, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Dividends per Share [Abstract] |  |  |  |  |
Payment of cash dividends |  |  |  | $ 19,289 | $ 20,686
Dividend Declared 2021-Q1 [Member] |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |
Dividend payable, date declared |  |  |  | 2021-02 |
Dividend payable per share (in dollars per share) |  |  | $ 0.38 |  |
Payment of cash dividends | $ 19,300 |  |  |  |
Dividend payable, date paid |  |  |  | Mar. 10, 2021 |
Dividend payable, date of record |  |  |  | Feb. 26, 2021 |
Dividend Declared 2021-Q2 [Member] | Subsequent Event [Member] |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |
Dividend payable, date declared |  | 2021-05 |  |  |
Dividend payable per share (in dollars per share) |  | $ 0.38 |  |  |
Dividend payable, date paid |  | Jun. 09, 2021 |  |  |
Dividend payable, date of record |  | May 28, 2021 |  |  |

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