Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Class A Common Stock
Class B Common Stock
Common​ Stock
Class A Common Stock
Common​ Stock
Class B Common Stock
Additional Paid-In Capital
Retained Earnings
Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2020       19,666,981 40,333,019      
Beginning balance at Dec. 31, 2020 $ 735,992     $ 197 $ 403 $ 18,035 $ 717,357 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock dividends (121,057)           (121,057)  
Dividend equivalents on unvested restricted stock units, net of forfeitures 0         2,879 (2,879)  
Issuance of Class A shares for acquisition of RMS (in shares)       996,644        
Issuance of Class A shares for acquisition of RMS 15,289     $ 10   15,279    
Stock-based compensation 5,982         5,982    
Vesting of restricted stock units (in shares)       60,287        
Non-controlling interest contributions 25             25
Net income 283,782           283,773 9
Ending balance (in shares) at Dec. 31, 2021   20,723,912 40,333,019 20,723,912 40,333,019      
Ending balance at Dec. 31, 2021 920,013     $ 207 $ 403 42,175 877,194 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation 7,322         7,322    
Dividend equivalents on unvested restricted stock units forfeited 0         (93) 93  
Vesting of restricted stock units (in shares)       520,142        
Vesting of restricted stock units 0     $ 5   (5)    
Shares of Class A common stock withheld related to net share settlement (in shares)       (117,060)        
Shares of Class A common stock withheld related to net share settlement (1,097)     $ (1)   (1,096)    
Repurchase and retirement of Class A common stock (in shares)       (543,864)        
Repurchase and retirement of Class A common stock (5,581)     $ (5)   (5,576)    
Net income 328,630           328,598 32
Ending balance (in shares) at Dec. 31, 2022   20,583,130 40,333,019 20,583,130 40,333,019      
Ending balance at Dec. 31, 2022 $ 1,249,287     $ 206 $ 403 $ 42,727 $ 1,205,885 $ 66