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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period Of Adoption, Adjustment
Common Stock
Retained Earnings
Stock in Rabbi Trust Assumed in Acquisition
Rabbi Trust Obligation
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019     29,601,000        
Beginning balance at Dec. 31, 2019 $ 852,401   $ 429,514 $ 417,764 $ (2,587) $ 2,587 $ 5,123
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 34,532     34,532      
Cash dividends declared (10,450)     (10,450)      
Change in Rabbi Trust obligation 0       370 (370)  
Stock repurchases (in shares)     (680,000)        
Stock repurchases (22,432)   $ (22,432)        
Stock-based compensation (in shares)     56,000        
Stock-based compensation 1,617   $ 1,617        
Other comprehensive income (loss) 12,223           12,223
Ending balance (in shares) at Jun. 30, 2020     28,977,000        
Ending balance at Jun. 30, 2020 867,891   $ 408,699 441,846 (2,217) 2,217 17,346
Beginning balance (in shares) at Dec. 31, 2019     29,601,000        
Beginning balance at Dec. 31, 2019 $ 852,401   $ 429,514 417,764 (2,587) 2,587 5,123
Ending balance (in shares) at Dec. 31, 2020 28,579,335   28,579,000        
Ending balance at Dec. 31, 2020 $ 893,421 $ (17,051) $ 400,582 478,489 (2,243) 2,243 14,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible Enumeration] us-gaap:AccountingStandardsUpdate201613Member            
Beginning balance (in shares) at Mar. 31, 2020     29,041,000        
Beginning balance at Mar. 31, 2020 $ 862,198   $ 410,236 430,709 (2,602) 2,602 21,253
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 16,352     16,352      
Cash dividends declared (5,215)     (5,215)      
Change in Rabbi Trust obligation 0       385 (385)  
Stock repurchases (in shares)     (104,000)        
Stock repurchases (2,432)   $ (2,432)        
Stock-based compensation (in shares)     40,000        
Stock-based compensation 895   $ 895        
Other comprehensive income (loss) (3,907)           (3,907)
Ending balance (in shares) at Jun. 30, 2020     28,977,000        
Ending balance at Jun. 30, 2020 $ 867,891   $ 408,699 441,846 (2,217) 2,217 17,346
Beginning balance (in shares) at Dec. 31, 2020 28,579,335   28,579,000        
Beginning balance at Dec. 31, 2020 $ 893,421 $ (17,051) $ 400,582 478,489 (2,243) 2,243 14,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 57,479     57,479      
Cash dividends declared (11,386)     (11,386)      
Change in Rabbi Trust obligation 0       315 (315)  
Stock repurchases (in shares)     (107,000)        
Stock repurchases (4,036)   $ (4,036)        
Stock withheld for payment of taxes (in shares)     (7,000)        
Stock withheld for payment of taxes (324)   $ (324)        
Stock-based compensation (in shares)     27,000        
Stock-based compensation 1,482   $ 1,482        
Other comprehensive income (loss) $ (15,075)           (15,075)
Ending balance (in shares) at Jun. 30, 2021 28,491,633   28,492,000        
Ending balance at Jun. 30, 2021 $ 904,510   $ 397,704 507,531 (1,928) 1,928 (725)
Beginning balance (in shares) at Mar. 31, 2021     28,489,000        
Beginning balance at Mar. 31, 2021 876,853   $ 397,094 483,944 (2,256) 2,256 (4,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 29,285     29,285      
Cash dividends declared (5,698)     (5,698)      
Change in Rabbi Trust obligation 0       328 (328)  
Stock withheld for payment of taxes (in shares)     (4,000)        
Stock withheld for payment of taxes (221)   $ (221)        
Stock-based compensation (in shares)     7,000        
Stock-based compensation 831   $ 831        
Other comprehensive income (loss) $ 3,460           3,460
Ending balance (in shares) at Jun. 30, 2021 28,491,633   28,492,000        
Ending balance at Jun. 30, 2021 $ 904,510   $ 397,704 $ 507,531 $ (1,928) $ 1,928 $ (725)