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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comp. Income (Loss), net
Balance at Dec. 31, 2017 $ 3,707,952 $ 77,740 $ 3,115,304 $ 519,144 $ (4,236)
Balance (in shares) at Dec. 31, 2017   77,740,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 1,700 $ 90 1,610    
Exercise of employee common stock options and related tax benefits (in shares)   90,000      
Common dividends paid (32,903)     (32,903)  
Issuance of restricted common shares, net of forfeitures 0 $ 141 (141)    
Issuance of restricted common shares, net of forfeitures (in shares)   141,000      
Restricted shares withheld for taxes & related tax benefit (6,808) $ (104) (6,704)    
Restricted shares withheld for taxes (in shares)   (104,000)      
Stock-based compensation expense 13,254   13,254    
Net income 264,122     264,122  
Other comprehensive income (loss) (50,276)       (50,276)
Balance at Sep. 30, 2018 3,897,041 $ 77,867 3,123,323 750,363 (54,512)
Balance (in shares) at Sep. 30, 2018   77,867,000      
Balance at Jun. 30, 2018 3,826,677 $ 77,855 3,119,461 667,594 (38,233)
Balance (in shares) at Jun. 30, 2018   77,855,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 0 $ 0 0    
Exercise of employee common stock options and related tax benefits (in shares)   0      
Common dividends paid (10,978)     (10,978)  
Issuance of restricted common shares, net of forfeitures 0 $ 22 (22)    
Issuance of restricted common shares, net of forfeitures (in shares)   22,000      
Restricted shares withheld for taxes & related tax benefit (629) $ (10) (619)    
Restricted shares withheld for taxes (in shares)   (10,000)      
Stock-based compensation expense 4,503   4,503    
Net income 93,747     93,747  
Other comprehensive income (loss) (16,279)       (16,279)
Balance at Sep. 30, 2018 3,897,041 $ 77,867 3,123,323 750,363 (54,512)
Balance (in shares) at Sep. 30, 2018   77,867,000      
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]          
Exercise of employee common stock options and related tax benefits 247 $ 10 237    
Exercise of employee common stock options and related tax benefits (in shares)   10,000      
Common dividends paid (37,415)     (37,415)  
Repurchase of common stock (48,489) $ (873) (47,616)    
Repurchase of common stock (in shares)   (873,000)      
Issuance of restricted common shares, net of forfeitures 0 $ 200 (200)    
Issuance of restricted common shares, net of forfeitures (in shares)   200,000      
Restricted shares withheld for taxes & related tax benefit (4,793) $ (85) (4,708)    
Restricted shares withheld for taxes (in shares)   (85,000)      
Stock-based compensation expense 15,091   15,091    
Net income 304,802     304,802  
Other comprehensive income (loss) 99,247       99,247
Balance at Sep. 30, 2019 4,294,630 $ 76,736 3,070,235 1,100,517 47,142
Balance (in shares) at Sep. 30, 2019   76,736,000      
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      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 108 $ 4 104    
Exercise of employee common stock options and related tax benefits (in shares)   4,000      
Common dividends paid (12,438)     (12,438)  
Repurchase of common stock (11,065) $ (198) (10,867)    
Repurchase of common stock (in shares)   (198,000)      
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 tax benefit (505) $ (9) (496)    
Restricted shares withheld for taxes (in shares)   (9,000)      
Stock-based compensation expense 5,018   5,018    
Net income 110,521     110,521  
Other comprehensive income (loss) 26,630       26,630
Balance at Sep. 30, 2019 $ 4,294,630 $ 76,736 $ 3,070,235 $ 1,100,517 $ 47,142
Balance (in shares) at Sep. 30, 2019   76,736,000