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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |
Tax benefit (expense) on change in retirement obligations, tax | $ 53 | $ 1,553 | $ 3,076
Tax benefit from change on derivatives designated as cash flow hedges, tax | $ 1,369 | $ 1,445 | $ 1,469
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans (in shares) | 688,563 | 696,133 | 583,385
Repurchase of common stock (in shares) | 876,423 | 388,953 | 1,273,961
Deferred compensation plan, tax | $ 4,967 | $ 5,493 | $ 4,267
Cash dividends declared, per common share outstanding (in dollars per share) | $ 2.00 | $ 2.00 | $ 1.72

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