Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Changes in Equity - Schedule of Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance $ 485,184 $ 512,137
Net income 50,052 57,401
Dividends paid (21,329) (124,098)
Conversion of Sub-shares into shares of common stock 0  
Other comprehensive income 28 13
Ending balance $ 513,935 445,343
Cumulative Effect, Period of Adoption, Adjustment    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance   $ (110)
Sub-share Certificates    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 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 7,756,156
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 0  
Beginning balance $ 0  
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) 7,756,156  
Ending balance $ 78  
Accum. Other Comp. Loss    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (2,693) $ (1,461)
Other comprehensive income 28 13
Ending balance (2,665) (1,448)
Retained Earnings    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 0  
Net income 50,052  
Dividends paid (21,329)  
Conversion of Sub-shares into shares of common stock 487,799  
Ending balance 516,522  
Net Proceeds from All Sources    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance 487,877 513,598
Net income   57,401
Dividends paid   (124,098)
Conversion of Sub-shares into shares of common stock (487,877)  
Ending balance $ 0 446,791
Net Proceeds from All Sources | Cumulative Effect, Period of Adoption, Adjustment    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance   $ (110)