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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Stockholders' Equity [Abstract] |  |  |
Tax benefit (expense) on change in retirement obligations, tax | $ (2,107) | $ (3,842) | $ 6,852
Tax benefit from change on derivatives designated as cash flow hedges, tax | $ 2,490 | $ 2,499 | $ 2,713
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans (in shares) | 594,919 | 685,501 | 571,751
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans, tax | $ 5,305 | $ 3,794 | $ 3,425
Repurchase of common stock (in shares) | 738,593 | 2,811,002 | 2,970,461
Cash dividends declared, per common share outstanding (in dollars per share) | $ 1.36 | $ 1.28 | $ 1.12

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