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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 09, 2020 | Jun. 10, 2020 | Mar. 11, 2020 | Oct. 30, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Feb. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  |  |  | $ 59,287 | $ 61,636
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |
Class A common stock repurchased |  |  |  |  |  |  |  | $ 19,994 | $ 0 | 127,361 | $ 825
Amount available for repurchases |  |  |  |  |  |  |  | $ 342,800 |  | $ 342,800 |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |
Class A common stock repurchased (in shares) |  |  |  |  |  |  |  | 400,000 | 0 | 4,800,000 | 14,000
Class A common stock repurchased |  |  |  |  |  |  |  | $ 19,994 | $ 0 | $ 127,361 | $ 825
Dividend Declared 2020-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2020-02 |  | 2020-02 |
Dividend payable per share (in dollars per share) |  |  |  |  |  |  | $ 0.375 |  |  |  |
Payment of cash dividends |  |  | $ 20,700 |  |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Mar. 11, 2020 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | Feb. 28, 2020 |
Dividend Declared 2020-Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2020-04 |  | 2020-04 |
Dividend payable per share (in dollars per share) |  |  |  |  |  | $ 0.375 |  |  |  |  |
Payment of cash dividends |  | $ 19,400 |  |  |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Jun. 10, 2020 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | May 29, 2020 |
Dividend Declared 2020-Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2020-07 |  | 2020-07 |
Dividend payable per share (in dollars per share) |  |  |  |  | $ 0.375 |  |  |  |  |  |
Payment of cash dividends | $ 19,200 |  |  |  |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  |  |  | Sep. 09, 2020 |
Dividend payable, date of record |  |  |  |  |  |  |  |  |  | Aug. 28, 2020 |
Dividend Declared 2020-Q4 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  | 2020-10 |  |  |  |  |  |  |
Dividend payable per share (in dollars per share) |  |  |  | $ 0.375 |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  | Dec. 09, 2020 |  |  |  |  |  |  |
Dividend payable, date of record |  |  |  | Nov. 27, 2020 |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Net Income per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from calculation of diluted earnings per share (in shares) |  |  |  |  |  |  |  | 200,000 | 1,300,000 | 600,000 | 1,200,000

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