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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income/(Loss) [Member] | Treasury Stock [Member] | Deferred Compensation Arrangements [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 41,606 | $ 409,984 | $ 525,985 | $ 30,720 | $ (20,391) | $ 0 | $ 987,904
Balance (in shares) at Dec. 31, 2014 | 40,747,721 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  |  | 91,230 |  |  |  | 91,230
Other comprehensive income (loss), net of tax |  |  |  | (11,485) |  |  | (11,485)
Dividends declared: |  |  |  |  |  |  |
Common |  |  | (50,624) |  |  |  | (50,624)
Common stock issued under employee stock plan | $ 459 | 9,315 |  |  |  |  | 9,774
Common stock issued under employee stock plan (in shares) | 458,817 |  |  |  |  |  |
Stock-based compensation |  | 4,201 |  |  |  |  | 4,201
Stock issued for acquisitions | $ 2,378 | 99,824 |  |  |  |  | 102,202
Stock issued for acquisitions (in shares) | 2,377,329 |  |  |  |  |  |
Treasury stock purchased |  |  |  |  | (9,126) |  | $ (9,126)
Treasury stock purchased (in shares) | (265,230) |  |  |  |  |  | (300,000)
Treasury stock issued to benefit plan |  | 4,691 |  |  | 11,880 |  | $ 16,571
Treasury stock issued to benefit plan (in shares) | 456,223 |  |  |  |  |  |
Balance at Dec. 31, 2015 | $ 44,443 | 528,015 | 566,591 | 19,235 | (17,637) | 0 | 1,140,647
Balance (in shares) at Dec. 31, 2015 | 43,774,860 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  |  | 103,812 |  |  |  | 103,812
Other comprehensive income (loss), net of tax |  |  |  | (11,392) |  |  | (11,392)
Dividends declared: |  |  |  |  |  |  |
Common |  |  | (55,711) |  |  |  | (55,711)
Common stock issued under employee stock plan | $ 507 | 10,036 |  |  |  |  | 10,543
Common stock issued under employee stock plan (in shares) | 507,784 |  |  |  |  |  |
Stock-based compensation |  | 4,783 |  |  |  |  | 4,783
Treasury stock purchased |  |  |  |  | (3,470) |  | $ (3,470)
Treasury stock purchased (in shares) | (67,826) |  |  |  |  |  | 0
Treasury stock issued to benefit plan |  | 2,941 |  |  | 5,947 |  | $ 8,888
Treasury stock issued to benefit plan (in shares) | 222,597 |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 44,950 | 545,775 | 614,692 | 7,843 | (15,160) | 0 | 1,198,100
Balance (in shares) at Dec. 31, 2016 | 44,437,415 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  |  | 150,717 |  |  |  | 150,717
Other comprehensive income (loss), net of tax |  |  |  | (10,897) |  |  | (10,897)
Reclassification related to tax effect of Tax Cuts and Jobs Act |  |  | 645 | (645) |  |  | 0
Dividends declared: |  |  |  |  |  |  |
Common |  |  | (65,497) |  |  |  | (65,497)
Common stock issued under employee stock plan | $ 265 | 4,298 |  |  |  |  | 4,563
Common stock issued under employee stock plan (in shares) | 264,640 |  |  |  |  |  |
Stock-based compensation |  | 5,137 |  |  |  |  | 5,137
Stock issued for acquisitions | $ 6,049 | 337,083 |  |  |  |  | 343,132
Stock issued for acquisitions (in shares) | 6,048,849 |  |  |  |  |  |
Deferred compensation arrangements acquired |  |  |  |  | (10,022) | 10,022 | 0
Deferred compensation arrangements acquired (in shares) | (179,003) |  |  |  |  |  |
Treasury stock purchased |  |  |  |  | (3,306) | 3,306 | $ 0
Treasury stock purchased (in shares) | (58,491) |  |  |  |  |  | 0
Treasury stock issued to benefit plan |  | 2,586 |  |  | 7,474 | 0 | $ 10,060
Treasury stock issued to benefit plan (in shares) | 182,667 |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 51,264 | $ 894,879 | $ 700,557 | $ (3,699) | $ (21,014) | $ 13,328 | $ 1,635,315
Balance (in shares) at Dec. 31, 2017 | 50,696,077 |  |  |  |  |  |

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Data Type: | na
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