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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Treasury Stock [Member] | Deferred Compensation Arrangements [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  |  | 40,106 |  |  |  | 40,106
Other comprehensive loss, net of tax |  |  |  | (31,527) |  |  | (31,527)
Cash dividends declared: |  |  |  |  |  |  |
Common, $0.34 per share |  |  | (17,259) |  |  |  | (17,259)
Common stock issued under employee stock ownership plan | $ 110 | 460 |  |  |  |  | 570
Common stock issued under employee stock ownership plan (in shares) | 110,413 |  |  |  |  |  |
Stock-based compensation |  | 1,715 |  |  |  |  | 1,715
Distribution of stock under deferred compensation arrangements |  |  |  |  | 1,898 | (1,898) | 0
Distribution of stock under deferred compensation arrangements (in shares) | 35,233 |  |  |  |  |  |
Treasury stock issued to benefit plans, net |  | 982 |  |  | 1,483 | 81 | 2,546
Treasury stock issued to benefit plans, net (in shares) | 41,880 |  |  |  |  |  |
Balance at Mar. 31, 2018 | $ 51,374 | $ 898,036 | $ 723,404 | $ (35,226) | $ (17,633) | $ 11,511 | $ 1,631,466
Balance (in shares) at Mar. 31, 2018 | 50,883,603 |  |  |  |  |  |

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