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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |
Pension and other postretirement adjustments, tax | $ 438 | $ 505
Amortization of forward starting swaps, tax | $ 361 | $ 371
Issuance of common stock from performance share units and exercise of stock options (in shares) | 264,090 | 227,932
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount | $ 3,415 | $ 2,934
Purchase of common stock (in shares) | 369,810 |

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