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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 67,138 $ 0 0 67,138            
Other comprehensive income (loss) 0 0 0 0 2,012 2,012            
Cash dividends paid 0 0 (30,453) 0 0 (30,453)            
Share-based compensation 0 (1,155) 0 0 0 (1,155)            
Non-vested stock issued upon vesting 0 (2,331) 0 $ 2,331 0 0            
Non-vested stock issued upon vesting (in shares)       (45,741)                
Benefit plans 0 72 0 $ 948 0 1,020            
Benefit plans (in shares)       (18,597)                
Other 0 (212) 0 $ (815) 0 (1,027)            
Other (in shares)       15,991                
Ending balance at Jun. 30, 2019 5,396 98,037 1,552,928 $ (595,336) (163,543) 897,482            
Ending balance (in shares) at Jun. 30, 2019       11,682,876                
Beginning balance at Mar. 31, 2019 5,396 100,485 1,533,832 $ (595,718) (166,271) 877,724            
Beginning balance (in shares) at Mar. 31, 2019       11,690,379                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 34,331 $ 0 0 34,331            
Other comprehensive income (loss) 0 0 0 0 2,728 2,728            
Cash dividends paid 0 0 (15,235) 0 0 (15,235)            
Share-based compensation 0 (1,842) 0 0 0 (1,842)            
Non-vested stock issued upon vesting 0 (547) 0 $ 547 0 0            
Non-vested stock issued upon vesting (in shares)       (10,725)                
Other 0 (59) 0 $ (165) 0 (224)            
Other (in shares)       3,222                
Ending balance at Jun. 30, 2019 5,396 98,037 1,552,928 $ (595,336) (163,543) 897,482            
Ending balance (in shares) at Jun. 30, 2019       11,682,876                
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 51,393 $ 0 0 51,393            
Other comprehensive income (loss) 0 0 0 0 (41,716) (41,716)            
Cash dividends paid 0 0 (33,018) 0 0 (33,018)            
Share-based compensation 0 2,662 0 0 0 2,662            
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 (14) 0 $ (401) 0 (415)            
Other (in shares)       7,850                
Ending balance at Jun. 30, 2020 5,396 99,962 1,553,622 $ (593,540) (204,724) 860,716            
Ending balance (in shares) at Jun. 30, 2020       11,647,627                
Beginning balance at Mar. 31, 2020 5,396 99,080 1,539,520 $ (593,977) (207,361) 842,658            
Beginning balance (in shares) at Mar. 31, 2020       11,656,206                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net earnings 0 0 30,620 $ 0 0 30,620            
Other comprehensive income (loss) 0 0 0 0 2,637 2,637            
Cash dividends paid 0 0 (16,518) 0 0 (16,518)            
Share-based compensation 0 1,485 0 0 0 1,485            
Non-vested stock issued upon vesting 0 (628) 0 $ 628 0 0            
Non-vested stock issued upon vesting (in shares)       (12,315)                
Other 0 25 0 $ (191) 0 (166)            
Other (in shares)       3,736                
Ending balance at Jun. 30, 2020 $ 5,396 $ 99,962 $ 1,553,622 $ (593,540) $ (204,724) $ 860,716            
Ending balance (in shares) at Jun. 30, 2020       11,647,627