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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comp. Income (Loss), net
Accounting Standards Update 2016-13
Accounting Standards Update 2016-13
Retained Earnings
Balance at Dec. 31, 2018 $ 3,965,940   $ 77,484 $ 3,107,431 $ 833,130 $ (52,105)    
Balance (in shares) at Dec. 31, 2018     77,484,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of employee common stock options & related tax benefits 130   $ 5 125        
Exercise of employee common stock options and related tax benefits (in shares)     5,000          
Common dividends paid (12,545)       (12,545)      
Repurchase of common stock (30,049)   $ (543) (29,506)        
Repurchase of common stock (in shares)     (543,000)          
Issuance of restricted common shares, net of forfeitures 0   $ 180 (180)        
Issuance of restricted common shares, net of forfeitures (in shares)     180,000          
Restricted shares withheld for taxes & related benefits (3,487)   $ (62) (3,425)        
Restricted shares withheld for taxes (in shares)     (62,000)          
Stock-based compensation expense 4,913     4,913        
Net income 93,960       93,960      
Other comprehensive income (loss) 37,077         37,077    
Balance at Mar. 31, 2019 4,055,939   $ 77,064 3,079,358 914,545 (15,028)    
Balance (in shares) at Mar. 31, 2019     77,064,000          
Balance at Dec. 31, 2018 3,965,940   $ 77,484 3,107,431 833,130 (52,105)    
Balance (in shares) at Dec. 31, 2018     77,484,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation expense 10,073              
Net income 194,281              
Other comprehensive income (loss) 72,617              
Balance at Jun. 30, 2019 $ 4,176,361   $ 76,929 3,076,486 1,002,434 20,512    
Balance (in shares) at Jun. 30, 2019     76,929,000          
Common Stock, Dividends, Per Share, Cash Paid $ 0.16              
Balance at Mar. 31, 2019 $ 4,055,939   $ 77,064 3,079,358 914,545 (15,028)    
Balance (in shares) at Mar. 31, 2019     77,064,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of employee common stock options & related tax benefits 9   $ 1 8        
Exercise of employee common stock options and related tax benefits (in shares)     1,000          
Common dividends paid (12,432)       (12,432)      
Repurchase of common stock (7,375)   $ (132) (7,243)        
Repurchase of common stock (in shares)     (132,000)          
Issuance of restricted common shares, net of forfeitures 0   $ 10 (10)        
Issuance of restricted common shares, net of forfeitures (in shares)     10,000          
Restricted shares withheld for taxes & related benefits (801)   $ (14) (787)        
Restricted shares withheld for taxes (in shares)     (14,000)          
Stock-based compensation expense 5,160     5,160        
Net income 100,321       100,321      
Other comprehensive income (loss) 35,540         35,540    
Balance at Jun. 30, 2019 4,176,361   $ 76,929 3,076,486 1,002,434 20,512    
Balance (in shares) at Jun. 30, 2019     76,929,000          
Balance at Dec. 31, 2019 4,355,748   $ 76,564 3,064,467 1,184,183 30,534    
Balance (in shares) at Dec. 31, 2019     76,564,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of employee common stock options & related tax benefits 5   $ 1 4        
Exercise of employee common stock options and related tax benefits (in shares)     1,000          
Common dividends paid (12,442)       (12,442)      
Repurchase of common stock (50,790)   $ (1,015) (49,775)        
Repurchase of common stock (in shares)     (1,015,000)          
Issuance of restricted common shares, net of forfeitures 0   $ 198 (198)        
Issuance of restricted common shares, net of forfeitures (in shares)     198,000          
Restricted shares withheld for taxes & related benefits (1,957)   $ (32) (1,925)        
Restricted shares withheld for taxes (in shares)     (32,000)          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits 2,469   $ 84 (2,553)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     84,000          
Stock-based compensation expense 5,501     5,501        
Net income 28,356       28,356      
Cumulative effect of change in accounting principle             $ (31,796) $ (31,796)
Other comprehensive income (loss) 94,972         94,972    
Balance at Mar. 31, 2020 4,385,128   $ 75,800 3,015,521 1,168,301 125,506    
Balance (in shares) at Mar. 31, 2020     75,800,000          
Balance at Dec. 31, 2019 4,355,748   $ 76,564 3,064,467 1,184,183 30,534    
Balance (in shares) at Dec. 31, 2019     76,564,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation expense 9,649              
Net income 90,800              
Other comprehensive income (loss) 133,992              
Balance at Jun. 30, 2020 $ 4,695,647 $ 217,632 $ 75,836 3,019,286 1,218,367 164,526    
Balance (in shares) at Jun. 30, 2020     75,836,000          
Common Stock, Dividends, Per Share, Cash Paid $ 0.16              
Balance at Mar. 31, 2020 $ 4,385,128   $ 75,800 3,015,521 1,168,301 125,506    
Balance (in shares) at Mar. 31, 2020     75,800,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock Issued During Period, Value, New Issues 217,632 217,632            
Exercise of employee common stock options & related tax benefits 225   $ 9 216        
Exercise of employee common stock options and related tax benefits (in shares)     9,000          
Common dividends paid (12,378)       (12,378)      
Issuance of restricted common shares, net of forfeitures 0   $ 38 (38)        
Issuance of restricted common shares, net of forfeitures (in shares)     38,000          
Restricted shares withheld for taxes & related benefits (553)   $ (13) (540)        
Restricted shares withheld for taxes (in shares)     (13,000)          
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits 19   $ 2 (21)        
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)     2,000          
Stock-based compensation expense 4,148     4,148        
Net income 62,444       62,444      
Other comprehensive income (loss) 39,020         39,020    
Balance at Jun. 30, 2020 $ 4,695,647 $ 217,632 $ 75,836 $ 3,019,286 $ 1,218,367 $ 164,526    
Balance (in shares) at Jun. 30, 2020     75,836,000