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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 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 |  |  | 84,712 |  |  |  | 84,712
Other comprehensive loss, net of tax |  |  |  | (42,584) |  |  | (42,584)
Cash dividends declared: |  |  |  |  |  |  |
Common, $0.68 per share |  |  | (34,698) |  |  |  | (34,698)
Common stock issued under employee stock ownership plan | $ 248 | 4,396 |  |  |  |  | 4,644
Common stock issued under employee stock ownership plan (in shares) | 248,151 |  |  |  |  |  |
Stock-based compensation |  | 3,396 |  |  |  |  | 3,396
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 |  | 2,242 |  |  | 3,782 | 150 | 6,174
Treasury stock issued to benefit plans, net (in shares) | 106,413 |  |  |  |  |  |
Balance at Jun. 30, 2018 | $ 51,512 | $ 904,913 | 750,779 | (46,491) | $ (15,334) | $ 11,580 | 1,656,959
Balance (in shares) at Jun. 30, 2018 | 51,085,874 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of change in accounting principle - equity securities |  |  | $ 208 | $ (208) |  |  | $ 0

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