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Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Common Stock, Shares, Outstanding | 32,955,547 |  | 32,955,547 |  |  | 34,377,388 |  |
Stockholders' Equity Attributable to Parent | $ 1,689,724 | $ 1,682,324 | $ 1,689,724 | $ 1,682,324 | $ 1,671,692 | $ 1,708,143 | $ 1,636,003 | $ 1,073,490
Held In Rabbi Trust At Cost [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ (4,712) | $ (4,713) | $ (4,712) | $ (4,713) | (4,649) | (4,735) | (4,648) | (4,718)
Retained Earnings |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.46 | $ 0.44 | $ 1.38 | $ 1.32 |  |  |  |
Stockholders' Equity Attributable to Parent | $ 696,546 | $ 621,831 | $ 696,546 | $ 621,831 | 676,834 | 654,182 | 585,111 | 546,736
Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 4,712 | 4,713 | 4,712 | 4,713 | 4,649 | 4,735 | 4,648 | 4,718
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 48,632 | 26,202 | 48,632 | 26,202 | 51,845 | 18,169 | 20,956 | (1,173)
Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | 328 | 342 | 328 | 342 | 328 | 342 | 342 | 279
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 944,218 | $ 1,033,949 | $ 944,218 | $ 1,033,949 | $ 942,685 | $ 1,035,450 | $ 1,029,594 | $ 527,648
Common Class A [Member] |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | 32,955,547 | 34,366,781 | 32,955,547 | 34,366,781 | 32,942,110 | 34,377,388 | 34,321,061 | 28,080,408

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