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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Balance at Dec. 31, 2016 $ 2,579,160 $ 3 $ 332,911 $ (101) $ 1,828,581 $ 417,766
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 122,249       122,249  
Other comprehensive income, net of tax 200,893         200,893
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect         (120,135) 120,135
Issuance of common stock 4,490   4,490      
Stock compensation expense 23,439   23,439      
Treasury Stock, Value, Acquired, Cost Method (2,920)     (2,920)    
Stock Issued During Period, Value, Treasury Stock Reissued 2,804     2,804    
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net 135   391   (256)  
Balance at Dec. 31, 2017 2,930,250 3 361,231 (217) 1,830,439 738,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 365,614       365,614  
Other comprehensive income, net of tax (106,495)         (106,495)
Issuance of common stock 5,271   5,271      
Stock compensation expense 27,840   27,840      
Treasury Stock, Value, Acquired, Cost Method (48,912)     (48,912)    
Balance at Dec. 31, 2018 4,020,331 3 394,342 (49,129) 3,722,073 (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Equity Securities without Readily Determinable Fair Value, Amount 600          
Net income 1,758,675       1,758,675  
Other comprehensive income, net of tax (40,390)         (40,390)
Issuance of common stock 5,017   5,017      
Stock compensation expense 35,593   35,593      
Treasury Stock, Value, Acquired, Cost Method (28,000)     (28,000)    
Stock Issued During Period, Value, Treasury Stock Reissued 3,831   (24,932) 38,732 (9,969)  
Balance at Dec. 31, 2019 5,755,057 $ 3 $ 410,020 $ (38,397) $ 5,470,779 $ (87,348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Equity Securities without Readily Determinable Fair Value, Amount $ 300