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Capital Stock, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  |  | $ 78,387 | $ 82,189 | $ 80,581
Dividend Declared 2020-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  | $ 0.375 |  |  |  |  |  |  |
Dividend Declared 2020-Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.375 |  |  |  |  |  |  |  |
Dividend Declared 2020-Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  | $ 0.375 |  |  |  |  |  |  |  |  |
Dividend Declared 2020-Q4 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) | $ 0.375 |  |  |  |  |  |  |  |  |  |
Dividend Declared 2019-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  |  |  | $ 0.37 |  |  |
Dividend Declared 2019-Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  |  | $ 0.37 |  |  |  |
Dividend Declared 2019-Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  | $ 0.37 |  |  |  |  |
Dividend Declared 2019-Q4 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  | $ 0.37 |  |  |  |  |  |
Dividend Declared 2021-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.38 |  |
Dividend payable, date to be paid |  |  |  |  |  |  |  |  | Mar. 10, 2021 |  |
Dividend payable, date of record |  |  |  |  |  |  |  |  | Feb. 26, 2021 |  |

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