Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited)

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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) - 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]                
Stock-based compensation 1,632         1,632    
Net income (loss) 160,604           160,604  
Ending balance (in shares) at Mar. 31, 2021       19,666,981 40,333,019      
Ending balance at Mar. 31, 2021 898,228     $ 197 $ 403 19,667 877,961 0
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]                
Net income (loss) 241,638              
Ending balance (in shares) at Sep. 30, 2021       20,663,625 40,333,019      
Ending balance at Sep. 30, 2021 937,515     $ 207 $ 403 39,321 897,584 0
Beginning balance (in shares) at Mar. 31, 2021       19,666,981 40,333,019      
Beginning balance at Mar. 31, 2021 898,228     $ 197 $ 403 19,667 877,961 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation 1,457         1,457    
Dividends paid on Class A and Class B common stock ($1.00 per share) (60,000)           (60,000)  
Dividend equivalents on unvested restricted stock units 0         1,447 (1,447)  
Net income (loss) 8,938           8,938  
Ending balance (in shares) at Jun. 30, 2021       19,666,981 40,333,019      
Ending balance at Jun. 30, 2021 848,623     $ 197 $ 403 22,571 825,452 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
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 1,507         1,507    
Dividend equivalents on unvested restricted stock units 0         (36) 36  
Net income (loss) 72,096           72,096  
Ending balance (in shares) at Sep. 30, 2021       20,663,625 40,333,019      
Ending balance at Sep. 30, 2021 937,515     $ 207 $ 403 39,321 897,584 0
Beginning balance (in shares) at Dec. 31, 2021   20,723,912 40,333,019 20,723,912 40,333,019      
Beginning balance at Dec. 31, 2021 920,013     $ 207 $ 403 42,175 877,194 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation 1,272         1,272    
Dividend equivalents on unvested restricted stock units 0         (40) 40  
Net income (loss) 207,973           207,958 15
Ending balance (in shares) at Mar. 31, 2022       20,723,912 40,333,019      
Ending balance at Mar. 31, 2022 1,129,258     $ 207 $ 403 43,407 1,085,192 49
Beginning balance (in shares) at Dec. 31, 2021   20,723,912 40,333,019 20,723,912 40,333,019      
Beginning balance at Dec. 31, 2021 920,013     $ 207 $ 403 42,175 877,194 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Repurchase and retirement of Class A common stock (in shares)       (280,914)        
Net income (loss) 343,629              
Ending balance (in shares) at Sep. 30, 2022   20,477,053 40,333,019 20,477,053 40,333,019      
Ending balance at Sep. 30, 2022 1,265,591     $ 205 $ 403 44,061 1,220,863 59
Beginning balance (in shares) at Mar. 31, 2022       20,723,912 40,333,019      
Beginning balance at Mar. 31, 2022 1,129,258     $ 207 $ 403 43,407 1,085,192 49
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation 1,728         1,728    
Dividend equivalents on unvested restricted stock units 0         (25) 25  
Vesting of restricted stock units (in shares)       34,055        
Repurchase and retirement of Class A common stock (in shares)       (141,952)        
Repurchase and retirement of Class A common stock (1,445)     $ (1)   (1,444)    
Net income (loss) 58,289           58,272 17
Ending balance (in shares) at Jun. 30, 2022       20,616,015 40,333,019      
Ending balance at Jun. 30, 2022 1,187,830     $ 206 $ 403 43,666 1,143,489 66
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation 1,917         1,917    
Repurchase and retirement of Class A common stock (in shares)       (138,962)        
Repurchase and retirement of Class A common stock (1,523)     $ (1)   (1,522)    
Net income (loss) 77,367           77,374 (7)
Ending balance (in shares) at Sep. 30, 2022   20,477,053 40,333,019 20,477,053 40,333,019      
Ending balance at Sep. 30, 2022 $ 1,265,591     $ 205 $ 403 $ 44,061 $ 1,220,863 $ 59