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Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
Shares, Outstanding |  | 73,249 |  |  |
Adjustment to opening retained earnings pursuant to adoption of ASU | Accounting Standards Update 2016-01 [Member] | $ 782 |  | $ 782 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.42 |  |  |  |
Balance, value at Dec. 31, 2018 | $ 2,033,649 | $ 1,642,246 | 426,708 | $ (35,305) |
Net income | 45,871 |  | 45,871 |  |
Other comprehensive income (loss) | 38,351 |  |  | 38,351 |
Issuance of common stock - stock option and other plans, shares |  | 25 |  |  |
Issuance of common stock - stock option and other plans, value | 878 | $ 878 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, shares |  | 355 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, value | 2,285 | $ 2,285 |  |  |
Purchase and retirement of common stock, Shares |  | (64) |  |  |
Purchase and retirement of common stock, Value | (2,432) | $ (2,432) |  |  |
Cash dividends declared on common stock | (30,764) |  | (30,764) |  |
Balance, value at Mar. 31, 2019 | 2,088,620 | $ 1,642,977 | 442,597 | 3,046 | $ 0
Shares, Outstanding |  | 73,565 |  |  |
Shares, Outstanding |  | 72,124 |  |  |
Adjustment to opening retained earnings pursuant to adoption of ASU | Accounting Standards Update 2016-02 [Member] | $ (2,457) |  | (2,457) |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.50 |  |  |  |
Balance, value at Dec. 31, 2019 | $ 2,159,962 | $ 1,650,753 | 519,676 | 40,367 | (50,834)
Net income | 14,628 |  | 14,628 |  |
Other comprehensive income (loss) | 96,840 |  |  | 96,840 |
Issuance of common stock - stock option and other plans, shares |  | 26 |  |  |
Issuance of common stock - stock option and other plans, value | 945 | $ 945 |  |  |
Stock Adjustment Deferred Compensation - Shares |  | 0 |  |  |
Stock Adjustment Value Deferred Compensation | 3 | $ 3 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, shares |  | 222 |  |  |
Issuance of common stock - restricted stock awards, net of canceled awards, value | 2,172 | $ 2,172 |  |  |
Purchase and retirement of common stock, Shares |  | 66 |  |  |
Purchase and retirement of common stock, Value | (2,474) | $ (2,474) |  |  |
Cash dividends declared on common stock | $ (36,017) |  | (36,017) |  |
Purchase of treasury stock, Shares | (731) | (731) |  |  |
Purchase of treasury stock, value | $ (20,000) |  |  |  | 20,000
Balance, value at Mar. 31, 2020 | $ 2,213,602 | $ 1,651,399 | $ 495,830 | $ 137,207 | $ (70,834)
Shares, Outstanding |  | 71,575 |  |  |

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