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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Balances at January 1, 2014 at Dec. 31, 2014 $ 784,077 $ 574,643 $ 352,893 $ (21,409) $ (122,050)
Balances at January 1, 2014 at Dec. 31, 2014   68,730,731     (7,274,184)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 75,063   75,063    
Other comprehensive loss (9,171)     (9,171)  
Cash dividends declared:          
Common stock at $0.64 per share in 2016, $0.64 per share in 2015, and $0.61 per share in 2014 $ (39,410)   (39,410)    
Treasury Stock, Shares, Acquired (239,967)       (239,967)
Treasury Stock, Value, Acquired, Cost Method $ (4,498)       $ (4,498)
Adjustments to Additional Paid in Capital, Other 13 $ (975)     $ 988
Stock Issued During Period, Shares, Other         58,812
Excess tax benefit on share-based compensation 146 146      
Exercise of stock options, net of shares purchased (in shares)         62,261
Exercise of stock options, net of shares purchased 679 (367)     $ 1,046
Restricted stock awards, net of forfeitures (in shares)         304,027
Restricted stock awards, net of forfeitures (1,266) (6,341)     $ 5,075
Share-based compensation expense 4,049 $ 4,049      
Ending Balances (in shares) at Dec. 31, 2015   68,730,731     (7,089,051)
Ending Balances at Dec. 31, 2015 809,376 $ 571,155 388,240 (30,580) $ (119,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adjustment for accounting changes FASB ASU 2014-01 adjustment (306)   (306)    
Net income 88,526   88,526    
Other comprehensive loss 2,137     2,137  
Cash dividends declared:          
Common stock at $0.64 per share in 2016, $0.64 per share in 2015, and $0.61 per share in 2014 $ (39,578)   (39,578)    
Treasury Stock, Shares, Acquired 0        
Adjustments to Additional Paid in Capital, Other $ 0 (1,507)     $ 1,507
Stock Issued During Period, Shares, Other         89,383
Excess tax benefit on share-based compensation 264 264      
Exercise of stock options, net of shares purchased (in shares)         65,515
Exercise of stock options, net of shares purchased 726 (379)     $ 1,105
Restricted stock awards, net of forfeitures (in shares)         182,974
Restricted stock awards, net of forfeitures (1,581) (4,505)     $ 2,924
Share-based compensation expense 5,354 $ 5,354      
Ending Balances (in shares) at Dec. 31, 2016   68,730,731     (6,751,179)
Ending Balances at Dec. 31, 2016 865,224 $ 570,382 437,188 (28,443) $ (113,903)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 96,787   96,787    
Other comprehensive loss 8,053     8,053  
Cash dividends declared:          
Common stock at $0.64 per share in 2016, $0.64 per share in 2015, and $0.61 per share in 2014 $ (42,128)   (42,128)    
Treasury Stock, Shares, Acquired 0        
Adjustments to Additional Paid in Capital, Other $ 0 (99)     $ 99
Stock Issued During Period, Shares, Other         5,843
Exercise of stock options, net of shares purchased (in shares) 101,507       58,212
Exercise of stock options, net of shares purchased $ 75 (912)     $ 987
Restricted stock awards, net of forfeitures (in shares)         25,480
Restricted stock awards, net of forfeitures (2,793) (1,708)     $ (1,085)
Share-based compensation expense 5,446 $ 5,446      
Ending Balances (in shares) at Dec. 31, 2017   68,730,731     (6,661,644)
Ending Balances at Dec. 31, 2017 $ 930,664 $ 573,109 $ 491,847 $ (20,390) $ (113,902)