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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
Beginning Balances (in shares) at Dec. 31, 2016   68,730,731     (6,751,179)
Beginning Balances at Dec. 31, 2016 $ 865,224 $ 570,382 $ 437,188 $ (28,443) $ (113,903)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 24,414   24,414    
Other comprehensive income (loss) 1,804     1,804  
Cash dividends declared :          
Common stock at $0.19 per share in 2018 and $0.17 per share in 2017 (10,529)   (10,529)    
Stock Issued During Period, Shares, Other         1,484
Adjustments to Additional Paid in Capital, Other 0 (25)     $ 25
Exercise of stock options, net of shares purchased (in shares)         34,037
Exercise of stock options, net of shares purchased 197 (377)     $ 574
Restricted stock awards, net of forfeitures (in shares)         119,212
Restricted stock awards, net of forfeitures (2,532) (3,556)     $ 1,024
Share-based compensation expense 1,487 $ 1,487      
Ending Balances (in shares) at Mar. 31, 2017   68,730,731     (6,596,446)
Ending Balances at Mar. 31, 2017 880,065 $ 567,911 451,073 (26,639) $ (112,280)
Beginning Balances (in shares) at Dec. 31, 2017   68,730,731     (6,661,644)
Beginning Balances at Dec. 31, 2017 930,664 $ 573,109 491,847 (20,390) $ (113,902)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 30,506   30,506    
Reclassification from AOCI, Current Period, Tax 0   4,942 (4,942)  
Other comprehensive income (loss) (9,351)     (9,351)  
Cash dividends declared :          
Common stock at $0.19 per share in 2018 and $0.17 per share in 2017 (11,797)   (11,797)    
Stock Issued During Period, Shares, Other         1,428
Adjustments to Additional Paid in Capital, Other 0 (24)     $ 24
Exercise of stock options, net of shares purchased (in shares)         11,800
Exercise of stock options, net of shares purchased 137 (65)     $ 202
Restricted stock awards, net of forfeitures (in shares)         131,508
Restricted stock awards, net of forfeitures (2,128) (3,517)     $ 1,389
Share-based compensation expense 1,954 $ 1,954      
Ending Balances (in shares) at Mar. 31, 2018   68,730,731     (6,516,908)
Ending Balances at Mar. 31, 2018 $ 939,985 $ 571,457 $ 515,498 $ (34,683) $ (112,287)