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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Common Stock, Shares, Outstanding | 33,024,882 |  | 32,965,692 |
Stockholders' Equity Attributable to Parent | $ 1,715,371 | $ 1,679,656 | $ 1,702,685 | $ 1,708,143
Held In Rabbi Trust At Cost [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | $ (3,080) | $ (4,604) | (3,066) | (4,735)
Retained Earnings |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.48 | $ 0.46 |  |
Stockholders' Equity Attributable to Parent | $ 741,883 | $ 667,084 | 716,024 | 654,182
Deferred Compensation, Share-based Payments [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | 3,080 | 4,604 | 3,066 | 4,735
AOCI Attributable to Parent [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | 27,157 | 49,728 | 40,695 | 18,169
Common Stock [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | 329 | 331 | 328 | 342
Additional Paid-in Capital [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | $ 946,002 | $ 962,513 | $ 945,638 | $ 1,035,450
Common Class A [Member] |  |  |  |
Common Stock, Shares, Outstanding | 33,024,882 | 33,260,005 | 32,965,692 | 34,377,388

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