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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Earnings Reinvested in the Business [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-In Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Earnings Reinvested in the Business [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance at Dec. 31, 2018 $ 5,396 $ 101,663 $ 1,516,243 $ (597,800) $ (165,555) $ 859,947            
Beginning balance (in shares) at Dec. 31, 2018       11,731,223                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 99,009 $ 0 0 99,009            
Other comprehensive income (loss) 0 0 0 0 (15,755) (15,755)            
Cash dividends paid 0 0 (45,688) 0 0 (45,688)            
Share-based compensation 0 (816) 0 0 0 (816)            
Non-vested stock issued upon vesting 0 (2,343) 0 $ 2,343 0 0            
Non-vested stock issued upon vesting (in shares)       (45,981)                
Benefit plans 0 72 0 $ 948 0 1,020            
Benefit plans (in shares)       (18,597)                
Other 0 (229) 0 $ (815) 0 (1,044)            
Other (in shares)       15,991                
Ending balance at Sep. 30, 2019 5,396 98,347 1,569,564 $ (595,324) (181,310) 896,673            
Ending balance (in shares) at Sep. 30, 2019       11,682,636                
Beginning balance at Jun. 30, 2019 5,396 98,037 1,552,928 $ (595,336) (163,543) 897,482            
Beginning balance (in shares) at Jun. 30, 2019       11,682,876                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 31,871 $ 0 0 31,871            
Other comprehensive income (loss) 0 0 0 0 (17,767) (17,767)            
Cash dividends paid 0 0 (15,235) 0 0 (15,235)            
Share-based compensation 0 339 0 0 0 339            
Non-vested stock issued upon vesting 0 (12) 0 $ 12 0 0            
Non-vested stock issued upon vesting (in shares)       (240)                
Other 0 (17) 0 $ 0 0 (17)            
Other (in shares)       0                
Ending balance at Sep. 30, 2019 5,396 98,347 1,569,564 $ (595,324) (181,310) 896,673            
Ending balance (in shares) at Sep. 30, 2019       11,682,636                
Beginning balance at Dec. 31, 2019 5,396 98,425 1,536,100 $ (595,324) (163,008) 881,589            
Beginning balance (ASU 2016-13 [Member]) at Dec. 31, 2019             $ 0 $ 0 $ (853) $ 0 $ 0 $ (853)
Beginning balance (in shares) at Dec. 31, 2019       11,682,636                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 84,303 $ 0 0 84,303            
Other comprehensive income (loss) 0 0 0 0 (23,394) (23,394)            
Cash dividends paid 0 0 (49,537) 0 0 (49,537)            
Share-based compensation 0 4,017 0 0 0 4,017            
Non-vested stock issued upon vesting 0 (1,352) 0 $ 1,352 0 0            
Non-vested stock issued upon vesting (in shares)       (26,515)                
Benefit plans 0 241 0 $ 833 0 1,074            
Benefit plans (in shares)       (16,344)                
Other 0 (13) 0 $ (401) 0 (414)            
Other (in shares)       7,850                
Ending balance at Sep. 30, 2020 5,396 101,318 1,570,013 $ (593,540) (186,402) 896,785            
Ending balance (in shares) at Sep. 30, 2020       11,647,627                
Beginning balance at Jun. 30, 2020 5,396 99,962 1,553,622 $ (593,540) (204,724) 860,716            
Beginning balance (in shares) at Jun. 30, 2020       11,647,627                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 32,910 $ 0 0 32,910            
Other comprehensive income (loss) 0 0 0 0 18,322 18,322            
Cash dividends paid 0 0 (16,519) 0 0 (16,519)            
Share-based compensation 0 1,355 0 0 0 1,355            
Other 0 1 0 $ 0 0 1            
Other (in shares)       0                
Ending balance at Sep. 30, 2020 $ 5,396 $ 101,318 $ 1,570,013 $ (593,540) $ (186,402) $ 896,785            
Ending balance (in shares) at Sep. 30, 2020       11,647,627