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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($) $ / shares shares
Statement of Stockholders' Equity [Abstract] |
Pension and other postretirement adjustments, tax | $ 1,753
Amortization of forward starting swaps, tax | $ 1,845
Issuance of common stock from performance share units and exercise of stock options (in shares) | shares | 470,104
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount | $ 5,579
Repurchase of common stock (in shares) | shares | 222,000
Cash dividends declared, per common share outstanding (in dollars per share) | $ / shares | $ 1.11

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