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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2017 $ 1,241,996 $ 458 $ 1,063,974 $ 177,149 $ 415
Balance (in shares) at Dec. 31, 2017   46,245,050      
Increase (Decrease) in Stockholders' Equity          
Net income 55,305     55,305  
Other comprehensive income (12,710)       (12,710)
Share-based compensation expense 3,917   3,917    
Issuance of restricted stock, net 0        
Issuance of restricted stock, net (in shares)   198,627      
Restricted stock surrendered and canceled (1,579)   (1,579)    
Restricted stock surrendered and canceled (in shares)   (28,849)      
Exercise of stock options 1,596 $ 1 1,595    
Exercise of stock options (in shares)   214,290      
Reclassification of certain tax effects of the Tax Cuts and Jobs Act 0     (82) 82
Balance at Jun. 30, 2018 1,288,525 $ 459 1,067,907 232,372 (12,213)
Balance (in shares) at Jun. 30, 2018   46,629,118      
Balance at Mar. 31, 2018 1,261,908 $ 472 1,065,218 205,069 (8,851)
Balance (in shares) at Mar. 31, 2018   46,527,566      
Increase (Decrease) in Stockholders' Equity          
Net income 27,303     27,303  
Other comprehensive income (3,362)       (3,362)
Share-based compensation expense 2,205   2,205    
Issuance of restricted stock, net 0        
Issuance of restricted stock, net (in shares)   1,205      
Restricted stock surrendered and canceled (41)   (41)    
Restricted stock surrendered and canceled (in shares)   (2,681)      
Exercise of stock options 512 $ (13) 525    
Exercise of stock options (in shares)   103,028      
Balance at Jun. 30, 2018 1,288,525 $ 459 1,067,907 232,372 (12,213)
Balance (in shares) at Jun. 30, 2018   46,629,118      
Balance at Dec. 31, 2018 $ 1,969,697 $ 617 1,674,274 300,407 (5,601)
Balance (in shares) at Dec. 31, 2018 62,480,755 62,480,755      
Increase (Decrease) in Stockholders' Equity          
Net income $ 38,718        
Other comprehensive income 10,661        
Balance at Mar. 31, 2019 2,007,064 $ 617 1,676,024 325,363 5,060
Balance (in shares) at Mar. 31, 2019   62,773,299      
Balance at Dec. 31, 2018 $ 1,969,697 $ 617 1,674,274 300,407 (5,601)
Balance (in shares) at Dec. 31, 2018 62,480,755 62,480,755      
Increase (Decrease) in Stockholders' Equity          
Net income $ 77,245     77,245  
Other comprehensive income 27,959       27,959
Repurchase and retirement of common stock (65,969) $ (22) (59,253) (6,694)  
Repurchase and retirement of common stock (in shares)   (2,219,246)      
Cash dividends declared ($0.22 per common share) (27,541)     (27,541)  
Dividend equivalents declared ($0.22 per restricted stock units) 0   51 (51)  
Share-based compensation expense 5,313   5,313    
Issuance of restricted stock, net 0        
Issuance of restricted stock, net (in shares)   304,754      
Restricted stock surrendered and canceled (2,629)   (2,629)    
Restricted stock surrendered and canceled (in shares)   (99,206)      
Exercise of stock options 381   381    
Exercise of stock options (in shares)   42,937      
Balance at Jun. 30, 2019 $ 1,984,456 $ 595 1,618,137 343,366 22,358
Balance (in shares) at Jun. 30, 2019 60,509,994 60,509,994      
Balance at Mar. 31, 2019 $ 2,007,064 $ 617 1,676,024 325,363 5,060
Balance (in shares) at Mar. 31, 2019   62,773,299      
Increase (Decrease) in Stockholders' Equity          
Net income 38,527     38,527  
Other comprehensive income 17,298       17,298
Repurchase and retirement of common stock (65,969) $ (22) (59,253) (6,694)  
Repurchase and retirement of common stock (in shares)   (2,219,246)      
Cash dividends declared ($0.22 per common share) (13,792)     (13,792)  
Dividend equivalents declared ($0.22 per restricted stock units) 0   38 (38)  
Share-based compensation expense 2,860   2,860    
Issuance of restricted stock, net 0        
Issuance of restricted stock, net (in shares)   15,000      
Restricted stock surrendered and canceled (1,582)   (1,582)    
Restricted stock surrendered and canceled (in shares)   (61,927)      
Exercise of stock options 50   50    
Exercise of stock options (in shares)   2,868      
Balance at Jun. 30, 2019 $ 1,984,456 $ 595 $ 1,618,137 $ 343,366 $ 22,358
Balance (in shares) at Jun. 30, 2019 60,509,994 60,509,994