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Capital Stock, Repurchases of Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2018 | Oct. 31, 2015 | Aug. 31, 2013 | Dec. 31, 1998
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Class A common stock repurchased | $ 825 | $ 69,565 | $ 71,731 |  |  |  |
1998 Stock Repurchase Plan [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  | $ 10,000
Increase in authorized amount |  |  |  |  |  | $ 400,000 |
2015 Stock Repurchase Plan [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Authorized amount |  |  |  |  | $ 500,000 |  |
2018 Stock Repurchase Plan [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Authorized amount |  |  |  | $ 500,000 |  |  |
Amount available for repurchases | 470,200 |  |  |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Class A common stock repurchased | $ 825 | $ 69,565 | $ 71,731 |  |  |  |
Treasury Stock [Member] | 2015 Stock Repurchase Plan [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Class A common stock repurchased (in shares) |  | 500,000 | 1,200,000 |  |  |  |
Class A common stock repurchased |  | $ 40,600 | $ 71,700 |  |  |  |
Treasury Stock [Member] | 2018 Stock Repurchase Plan [Member] |  |  |  |  |  |  |
Repurchases of Common Stock [Abstract] |  |  |  |  |  |  |
Class A common stock repurchased (in shares) | 14,000 | 400,000 |  |  |  |  |
Class A common stock repurchased | $ 800 | $ 29,000 |  |  |  |  |

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