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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common stock
Paid-in capital
Treasury stock
Accumulated other comprehensive loss
Retained earnings
ASU 2016-09
Paid-in capital
ASU 2016-09
Retained earnings
ASU 2016-01
Accumulated other comprehensive loss
ASU 2016-01
Retained earnings
Balance, beginning of year at Dec. 31, 2015   $ 340,097 $ 1,670,238 $ (3,362) $ (60,880) $ 290,047        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Issuance of common stock   18,313 113,146              
Net common stock issued under share-based compensation plans   990 (6,020)              
Reissuance of treasury stock, net under share-based compensation plans     (130) 130            
Tax benefit from share-based compensation     67              
Equity compensation     11,373              
Reacquisition of convertible junior subordinated debentures-equity component     (6,337)              
Purchases of common stock $ (147,100)     (147,127)            
Reissuance of treasury stock, net       0            
Other comprehensive (loss) income (14,220)       (14,220)          
Net income 342,517         342,517        
Balance, end of year at Dec. 31, 2016 2,548,842 359,400 1,782,337 (150,359) (75,100) 632,564        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cumulative effect of accounting standard update             $ 49 $ 153    
Issuance of common stock   10,386 60,903              
Net common stock issued under share-based compensation plans   781 (7,602)              
Reissuance of treasury stock, net under share-based compensation plans     0 0            
Equity compensation     14,895              
Purchases of common stock       0            
Reissuance of treasury stock, net       150,359   (21,740)        
Other comprehensive (loss) income 41,739       41,739          
Net income 355,761         355,761        
Cumulative effect to reclassify certain tax effects from accumulated other comprehensive loss         (10,422) 10,422        
Balance, end of year at Dec. 31, 2017 3,154,526 370,567 1,850,582 0 (43,783) 977,160        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Cumulative effect of accounting standard update         (18)       $ (18) $ 18
Issuance of common stock   0 0              
Net common stock issued under share-based compensation plans   786 (8,917)              
Reissuance of treasury stock, net under share-based compensation plans     0 0            
Equity compensation     20,871              
Purchases of common stock       (175,059)            
Reissuance of treasury stock, net       0            
Other comprehensive (loss) income (80,413)       (80,413)          
Net income 670,097         670,097        
Balance, end of year at Dec. 31, 2018 $ 3,581,891 $ 371,353 $ 1,862,536 $ (175,059) $ (124,214) $ 1,647,275