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Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |
Dividends paid | $ 109,147 | $ 106,943 | $ 101,511 |
Amount paid for repurchase of common stock | $ 15,740 | $ 29,100 | $ 46,957 |
Treasury |  |  |  |
Class of Stock [Line Items] |  |  |  |
Repurchased shares | 614,077 | 1,205,790 | 1,841,800 |
Amount paid for repurchase of common stock | $ 15,740 | $ 29,100 | $ 46,957 |
Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares authorized under share repurchase program |  |  |  | 4,000,000
Remaining number of shares authorized to be repurchased | 547,000 |  |  |

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