Quarterly report pursuant to Section 13 or 15(d)

Changes in Equity - Schedule of Stockholders' Equity (Details)

v3.21.2
Changes in Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 513,935 $ 485,184 $ 445,343 $ 512,137 $ 485,184 $ 512,137
Net income 57,046 50,052 27,583 57,401 107,098 84,984
Dividends paid (21,329) (21,329)   (124,098)    
Repurchases of common stock (2,504)          
Conversion of Sub-shares into shares of common stock   0        
Other comprehensive income 29 28 13 14 57 27
Ending balance $ 547,177 $ 513,935 $ 472,939 445,343 $ 547,177 $ 472,939
Cash dividends per Sub-share Certificate (in dollars per share) $ 2.75 $ 2.75 $ 0   $ 5.50 $ 16.00
Cumulative effect of accounting change            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance     $ 0 (111)   $ (111)
Ending balance       $ 0    
Sub-share Certificates            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 0 7,756,156 7,756,156 7,756,156 7,756,156 7,756,156
Conversion of Sub-shares into shares of common stock (in shares)   (7,756,156)        
Ending balance (in shares) 0 0 7,756,156 7,756,156 0 7,756,156
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 7,756,156 0     0  
Beginning balance $ 78 $ 0     $ 0  
Repurchases of common stock (in shares) (1,633)          
Conversion of Sub-shares into shares of common stock (in shares)   7,756,156        
Conversion of Sub-shares into shares of common stock   $ 78        
Ending balance (in shares) 7,754,523 7,756,156     7,754,523  
Ending balance $ 78 $ 78     $ 78  
Treasury Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (in shares) 0 0     0  
Beginning balance $ 0 $ 0     $ 0  
Repurchases of common stock (in shares) 1,633       1,633  
Repurchases of common stock $ (2,504)          
Ending balance (in shares) 1,633 0     1,633  
Ending balance $ (2,504) $ 0     $ (2,504)  
Accum. Other Comp. Loss            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (2,665) (2,693) $ (1,447) $ (1,461) (2,693) $ (1,461)
Other comprehensive income 29 28 13 14    
Ending balance (2,636) (2,665) (1,434) (1,447) (2,636) (1,434)
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 516,522 0     0  
Net income 57,046 50,052        
Dividends paid (21,329) (21,329)        
Conversion of Sub-shares into shares of common stock   487,799        
Ending balance 552,239 516,522     552,239  
Net Proceeds from All Sources            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 0 487,877 446,790 513,598 487,877 513,598
Net income     27,583 57,401    
Dividends paid       (124,098)    
Conversion of Sub-shares into shares of common stock   (487,877)        
Ending balance $ 0 $ 0 474,373 446,790 $ 0 474,373
Net Proceeds from All Sources | Cumulative effect of accounting change            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance     $ 0 (111)   $ (111)
Ending balance       $ 0