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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Dividends paid |  | $ 106,943 | $ 101,511 | $ 205,468 |
Amount paid for repurchase of common stock |  | $ 29,100 | $ 46,957 | $ 83,593 |
Treasury |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchased shares |  | 1,205,790 | 1,841,800 | 3,053,204 |
Amount paid for repurchase of common stock |  | $ 29,100 | $ 46,957 | $ 83,593 |
Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized under share repurchase program |  |  |  |  | 4,000,000.0
Remaining number of shares authorized to be repurchased |  | 1,000,000 |  |  |
Special Dividend |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid | $ 102,200 |  |  |  |
Common stock, dividends, per share, cash paid (usd per share) | $ 1 |  |  |  |

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