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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2020
Mar. 31, 2020
Oct. 31, 2016
Class of Stock [Line Items]              
Dividends paid   $ 207,765 $ 109,147 $ 106,943      
Special dividends paid $ 99,300            
Special dividend paid (usd per share) $ 1.00            
Amount paid for repurchase of common stock   67,905 $ 15,740 $ 29,100      
Accrued in other current liabilities $ 1,100 $ 1,100          
Class B              
Class of Stock [Line Items]              
Number of shares authorized under share repurchase program (in shares)         3,500,000 500,000 4,000,000
Repurchased shares (in shares)   2,900,000          
Amount paid for repurchase of common stock   $ 67,900          
Remaining number of shares authorized to be repurchased (in shares) 1,700,000 1,700,000