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Stock Transactions and Unit Redemptions - Additional Information (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
class
vote
$ / shares
shares
Mar. 31, 2021
$ / shares
shares
Jun. 30, 2020
shares
Jun. 30, 2021
USD ($)
shares
vote
class
$ / shares
Jun. 30, 2020
shares
Aug. 05, 2021
USD ($)
Feb. 17, 2021
shares
Dec. 31, 2020
$ / shares
shares
Mar. 31, 2020
shares
Dec. 31, 2019
shares
Class of Stock                    
Number of authorized classes of common stock | class 2     2            
Number of shares authorized to be repurchased (in shares)             400,000,000.0      
Subsequent Event                    
Class of Stock                    
Remaining from debt repurchase authorization | $           $ 400,000        
Common Class A                    
Class of Stock                    
Common stock, votes per share | vote 1     1            
Common stock, shares authorized (in shares) 1,000,000,000.0     1,000,000,000.0       1,000,000,000    
Common stock, par value (in usd per share) | $ / shares $ 0.01     $ 0.01       $ 0.01    
Common stock, shares outstanding (in shares) 179,736,458 163,113,922 157,811,436 179,736,458 157,811,436     161,175,894 156,701,746 156,265,461
Treasury stock repurchases (in shares) 3,613,098 879,243 0 4,492,341          
Shares repurchased price (in dollars per share) | $ / shares $ 12.81 $ 10.58   $ 12.36            
Share repurchase and redemption unit remaining authorized amount | $ $ 342,365     $ 342,365            
Common Class B                    
Class of Stock                    
Common stock, votes per share | vote 10     10            
Common stock, shares authorized (in shares) 500,000,000     500,000,000       500,000,000    
Common stock, par value (in usd per share) | $ / shares $ 0.01     $ 0.01       $ 0.01    
Conversion of common stock (in shares)       1            
Common stock, shares outstanding (in shares) 21,285,533     21,285,533       21,285,533