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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Total
Common Shares Outstanding
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Non- Controlling Interest
Balance at beginning of period at Dec. 31, 2016 $ 504,675   $ 530,932 $ 84,180 $ (108,941) $ (1,521) $ 25
Balance (in shares) at Dec. 31, 2016   30,796,243          
Increase (Decrease) in Shareholders' Equity              
Net income 36,916       36,916    
Other comprehensive loss 4,737         4,737  
Cash dividends (of $0.61 and $0.52 per share, respectively) (15,888)       (15,888)    
Net shares of common stock sold by directors' deferred compensation plan (385)   (385)        
Shares of common stock repurchased and other related costs $ (21,304)   (21,304)        
Shares of common stock repurchased and other related costs (in shares) (697,483) (697,483)          
Share-based compensation $ 1,120   0 1,120      
Share-based compensation (in shares)   89,988          
Net loss from variable interest entity (1)           (1)
Balance at end of period at Sep. 30, 2017 509,870   509,243 85,300 (87,913) 3,216 24
Balance (in shares) at Sep. 30, 2017   30,188,748          
Balance at beginning of period at Dec. 31, 2016 504,675   $ 530,932 84,180 (108,941) (1,521) 25
Balance (in shares) at Dec. 31, 2016   30,796,243          
Increase (Decrease) in Shareholders' Equity              
Shares of common stock repurchased and other related costs (in shares)     (864,483)        
Balance at end of period at Dec. 31, 2017 500,035   $ 503,988 86,098 (89,036) (1,039) 24
Balance at end of period (As Adjusted) at Dec. 31, 2017 $ 500,035   503,988 86,098 (88,897) (1,178) 24
Balance (in shares) at Dec. 31, 2017 30,024,222 30,024,222          
Balance (in shares) (As Adjusted) at Dec. 31, 2017   30,024,222          
Increase (Decrease) in Shareholders' Equity              
Impact of the adoption of new accounting standards $ 0       139 (139)  
Impact of the adoption of new accounting standards | Accounting Standards Updates           (139)  
Impact of the adoption of new accounting standards | Accounting Standards Updates 0       1,836 (1,836)  
Net income 43,694       43,694    
Other comprehensive loss (24,089)         (24,089)  
Cash dividends (of $0.61 and $0.52 per share, respectively) (18,039)       (18,039)    
Net shares of common stock sold by directors' deferred compensation plan (504)   (504)        
Shares of common stock repurchased and other related costs $ (24,763)   $ (24,763)        
Shares of common stock repurchased and other related costs (in shares) (849,290) (849,290) (849,290)        
Share-based compensation $ 1,841   $ 0 1,841     0
Share-based compensation (in shares)   95,466          
Net loss from variable interest entity (24)           (24)
Balance at end of period at Sep. 30, 2018 $ 478,151   $ 478,721 $ 87,939 $ (61,406) $ (27,103) $ 0
Balance (in shares) at Sep. 30, 2018 29,270,398 29,270,398