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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Condensed Consolidated Balance Sheets |  |
Allowance for doubtful accounts receivable | $ 2,497 | $ 3,402
Accumulated depreciation on property, plant and equipment | 233,597 | 231,167
Accumulated amortization on other intangible assets | 9,651 | 9,541
Deferred income taxes included in other long-term liabilities | $ 58,587 | $ 53,935
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shares authorized (in shares) | 250,000,000 | 250,000,000
Common stock, shares issued (in shares) | 119,063,456 | 118,737,456
Treasury stock, shares (in shares) | 56,532,637 | 56,348,026

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