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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Retained Earnings [Member]
Stock in Rabbi Trust Assumed in Acquisition [Member]
Rabbi Trust Obligation [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning balance at Dec. 31, 2017 $ 432,794 $ 264,331 $ (3,581) $ 3,581 $ (4,146) $ 692,979
Beginning balance, shares at Dec. 31, 2017 29,639         29,639,374
Net income   20,673       $ 20,673
Cash dividends declared   (2,966)       (2,966)
Change in Rabbi Trust Obligation     (7) 7  
Stock option exercises $ 108         108
Stock option exercises, shares 8          
Stock-based compensation $ 403         403
Stock-based compensation, shares 14          
Other comprehensive income (loss)         (5,547) (5,547)
Ending balance at Mar. 31, 2018 $ 433,305 282,038 (3,588) 3,588 (9,693) $ 705,650
Ending balance, shares at Mar. 31, 2018 29,661         29,660,967
Beginning balance at Dec. 31, 2018 $ 434,453 341,738 (3,235) 3,235 (11,961) $ 764,230
Beginning balance, shares at Dec. 31, 2018 29,725         29,724,874
Net income 22,285 $ 22,285
Cash dividends declared (3,568) (3,568)
Change in Rabbi Trust Obligation (10) 10
Stock withheld for payment of taxes $ (91)         (91)
Stock withheld for payment of taxes, shares (3)          
Stock-based compensation $ 586         586
Stock-based compensation, shares 24          
Other comprehensive income (loss)         4,697 4,697
Ending balance at Mar. 31, 2019 $ 434,948 $ 360,455 $ (3,245) $ 3,245 $ (7,264) $ 788,139
Ending balance, shares at Mar. 31, 2019 29,746         29,746,455