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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Balance, beginning of period at Dec. 31, 2020   $ 1,686 $ 1,571,163 $ 138,274 $ 2,151,510 $ 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   9 (9)      
Cancellation of treasury stock   (8) (23,945)     23,953
Dividends and dividend equivalents declared     369   (37,385)  
Stock-based compensation expense     10,564      
Other comprehensive loss $ (22,843)     (22,843)    
Net income 295,443       295,443  
Treasury stock acquired           (23,953)
Balance, end of period at Jun. 30, 2021 4,084,828 1,687 1,558,142 115,431 2,409,568 0
Balance, beginning of period at Mar. 31, 2021   1,693 1,571,134 79,071 2,269,039 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   1 (1)      
Cancellation of treasury stock   (7) (18,569)     18,576
Dividends and dividend equivalents declared     193   (19,266)  
Stock-based compensation expense     5,385      
Other comprehensive loss 36,360     36,360    
Net income 159,795       159,795  
Treasury stock acquired           (18,576)
Balance, end of period at Jun. 30, 2021 4,084,828 1,687 1,558,142 115,431 2,409,568 0
Balance, beginning of period at Dec. 31, 2021 4,236,114 1,641 1,428,952 50,707 2,754,814 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   9 (9)      
Cancellation of treasury stock   (35) (97,717)     97,752
Dividends and dividend equivalents declared     419   (44,453)  
Stock-based compensation expense     9,005      
Other comprehensive loss (337,274)     (337,274)    
Net income 505,936       505,936  
Treasury stock acquired           (97,752)
Balance, end of period at Jun. 30, 2022 4,271,995 1,615 1,340,650 (286,567) 3,216,297 0
Balance, beginning of period at Mar. 31, 2022   1,622 1,358,583 (152,299) 3,007,162 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   2 (2)      
Cancellation of treasury stock   (9) (22,321)     22,330
Dividends and dividend equivalents declared     192   (22,634)  
Stock-based compensation expense     4,198      
Other comprehensive loss (134,268)     (134,268)    
Net income 231,769       231,769  
Treasury stock acquired           (22,330)
Balance, end of period at Jun. 30, 2022 $ 4,271,995 $ 1,615 $ 1,340,650 $ (286,567) $ 3,216,297 $ 0