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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cumulative effect of change in accounting principle, taxes | $ 8,380 | $ 8,454 | $ 10,065
Unrealized loss on investment, taxes | 247 | 43 | 0
Adjustment to postretirement benefit plans, taxes | $ (324) | $ 22 | $ 0
Common stock, dividends per share, paid (usd per share) | $ 1.28 | $ 1.2 | $ 1.12
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Cumulative effect of change in accounting principle, taxes |  | $ 33 | $ 1,507

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