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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 1,616 $ 87 1,529    
Exercise of employee common stock options and related tax benefits (in shares)   87,000      
Common dividends paid (10,974)     (10,974)  
Issuance of restricted common shares, net of forfeitures 0 $ 106 (106)    
Issuance of restricted common shares, net of forfeitures (in shares)   106,000      
Restricted shares withheld for taxes and related tax benefit (5,265) $ (80) (5,185)    
Stock-based compensation expense 4,448   4,448    
Restricted shares withheld for taxes (in shares)   (80,000)      
Net income 83,510     83,510  
Other comprehensive income (loss) (31,984)       (31,984)
Balance at Mar. 31, 2018 3,749,303 $ 77,853 3,115,990 591,680 (36,220)
Balance (in shares) at Mar. 31, 2018   77,853,000      
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]          
Stock-based compensation expense 8,751        
Net income 170,375        
Other comprehensive income (loss) (33,997)        
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      
Balance at Mar. 31, 2018 3,749,303 $ 77,853 3,115,990 591,680 (36,220)
Balance (in shares) at Mar. 31, 2018   77,853,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of employee common stock options and related tax benefits 82 $ 3 79    
Exercise of employee common stock options and related tax benefits (in shares)   3,000      
Common dividends paid (10,951)     (10,951)  
Issuance of restricted common shares, net of forfeitures 0 $ 13 (13)    
Issuance of restricted common shares, net of forfeitures (in shares)   13,000      
Restricted shares withheld for taxes and related tax benefit (912) $ (14) (898)    
Stock-based compensation expense 4,303   4,303    
Restricted shares withheld for taxes (in shares)   (14,000)      
Net income 86,865     86,865  
Other comprehensive income (loss) (2,013)       (2,013)
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      
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 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 (in shares)   (543,000)      
Repurchase of common stock (30,049) $ (543) (29,506)    
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 and related tax benefit (3,487) $ (62) (3,425)    
Stock-based compensation expense 4,913   4,913    
Restricted shares withheld for taxes (in shares)   (62,000)      
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      
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 and 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 (in shares)   (132,000)      
Repurchase of common stock (7,375) $ (132) (7,243)    
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 and related tax benefit (801) $ (14) (787)    
Stock-based compensation expense 5,160   5,160    
Restricted shares withheld for taxes (in shares)   (14,000)      
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