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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Accounts receivable, accumulated provision for doubtful accounts | $ 8,235 | $ 8,226
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common stock, authorized shares (in shares) | 320,000,000 | 320,000,000
Common stock, shares issued (in shares) | 257,225,000 | 267,871,000
Treasury stock, shares at cost (in shares) | 2,799,000 | 3,551,000
Treasury stock, shares held in rabbi trust (in shares) | 299,000 | 253,000

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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