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Equity - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Equity, Class of Treasury Stock [Line Items]                
Purchase of treasury stock (in shares) 993,100   843,416   2,498,100 1,557,667    
Purchase of treasury stock $ 31,797 $ 45,030 $ 18,126 $ 15,959 $ 76,800      
Class B Shares                
Equity, Class of Treasury Stock [Line Items]                
Number of shares authorized under share repurchase program (in shares)             4,000,000.0 3,500,000
Purchase of treasury stock (in shares)         2,500,000      
Remaining number of shares authorized to be repurchased (in shares) 3,200,000       3,200,000