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Consolidated Statements of Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2014 26,260,543        
Balance at Dec. 31, 2014 $ 5,133 $ 3,059 $ 291,101 $ (17,326) $ 281,967
Net income     25,109   25,109
Other comprehensive loss       (5,089) (5,089)
Issuance of treasury shares (in shares) 7,500        
Issuance of treasury shares $ 2 184 26   212
Treasury shares repurchased (in shares) (184,420)        
Treasury shares repurchased $ (40) (3,243) (1,296)   (4,579)
Cash dividends     (10,599)   (10,599)
Balances (in shares) at Dec. 31, 2015 26,083,623        
Balance at Dec. 31, 2015 $ 5,095   304,341 (22,415) 287,021
Net income     24,883   24,883
Other comprehensive loss       1,950 1,950
Issuance of treasury shares (in shares) 9,500        
Issuance of treasury shares $ 2 215 35   252
Cash dividends     (11,218)   (11,218)
Balances (in shares) at Dec. 31, 2016 26,093,123        
Balance at Dec. 31, 2016 $ 5,097 215 318,041 (20,465) 302,888
Net income     26,555   26,555
Other comprehensive loss       7,956 7,956
Issuance of treasury shares (in shares) 13,500        
Issuance of treasury shares $ 3 311 50   364
Cash dividends     (12,268)   (12,268)
Balances (in shares) at Dec. 31, 2017 26,106,623        
Balance at Dec. 31, 2017 $ 5,100 $ 526 $ 332,378 $ (12,509) $ 325,495