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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member] | Deferred Compensation Arrangements [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  | 78,691 |  |  |  | 78,691
Other comprehensive income, net of tax |  |  |  | 8,334 |  |  | 8,334
Cash dividends declared: |  |  |  |  |  |  |
Common, $0.98 per share |  |  | (48,203) |  |  |  | (48,203)
Common stock issued under employee stock ownership plan | $ 238 | 3,502 |  |  |  |  | 3,740
Common stock issued under employee stock ownership plan (in shares) | 237,525 |  |  |  |  |  |
Stock-based compensation |  | 3,985 |  |  |  |  | 3,985
Stock issued for acquisitions | $ 6,006 | 334,731 |  |  |  |  | 340,737
Stock issued for acquisitions (in shares) | 6,006,301 |  |  |  |  |  |
Deferred compensation arrangements acquired |  |  |  |  | (10,022) | 10,022 | 0
Deferred compensation arrangements acquired (in shares) | (179,003) |  |  |  |  |  |
Treasury stock issued to benefit plans, net |  | 1,893 |  |  | 2,742 | 3,226 | 7,861
Treasury stock issued to benefit plans, net (in shares) | 84,890 |  |  |  |  |  |
Balance at Sep. 30, 2017 | $ 51,194 | $ 889,886 | $ 645,180 | $ 16,177 | $ (22,440) | $ 13,248 | $ 1,593,245
Balance (in shares) at Sep. 30, 2017 | 50,587,128 |  |  |  |  |  |

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