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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   (31) (94,783)     94,814
Dividends and dividend equivalents declared     559   (57,505)  
Stock-based compensation expense     16,075      
Other comprehensive loss $ (59,760)     (59,760)    
Net income 500,796       500,796  
Treasury stock acquired           (94,814)
Balance, end of period at Sep. 30, 2021 4,167,984 1,664 1,493,005 78,514 2,594,801 0
Balance, beginning of period at Jun. 30, 2021   1,687 1,558,142 115,431 2,409,568 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   0 0      
Cancellation of treasury stock   (23) (70,838)     70,861
Dividends and dividend equivalents declared     190   (20,120)  
Stock-based compensation expense     5,511      
Other comprehensive loss (36,917)     (36,917)    
Net income 205,353       205,353  
Treasury stock acquired           (70,861)
Balance, end of period at Sep. 30, 2021 4,167,984 1,664 1,493,005 78,514 2,594,801 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) (97,735)     97,770
Dividends and dividend equivalents declared     683   (68,229)  
Stock-based compensation expense     13,707      
Other comprehensive loss (474,284)     (474,284)    
Net income 683,987       683,987  
Treasury stock acquired           (97,770)
Balance, end of period at Sep. 30, 2022 4,294,208 1,615 1,345,598 (423,577) 3,370,572 0
Balance, beginning of period at Jun. 30, 2022   1,615 1,340,650 (286,567) 3,216,297 0
Changes in Stockholders' Equity            
Issuance of management incentive shares   0 0      
Cancellation of treasury stock   0 (18)     18
Dividends and dividend equivalents declared     264   (23,776)  
Stock-based compensation expense     4,702      
Other comprehensive loss (137,010)     (137,010)    
Net income 178,051       178,051  
Treasury stock acquired           (18)
Balance, end of period at Sep. 30, 2022 $ 4,294,208 $ 1,615 $ 1,345,598 $ (423,577) $ 3,370,572 $ 0