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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Stockholders' Equity [Abstract] |  |  |
Common stock, par value (in usd per share) | $ 0.001 | $ 0.001 | $ 0.001
Options exercised, shares | 145,438 | 208,306 | 142,203
Conversion of common stock units, shares | 30,368 | 15,981 | 15,629
Conversion of restricted stock units, shares | 212,382 | 313,292 | 222,297
Cash dividends (in usd per share) | $ 1.14 | $ 1.10 | $ 1.06
Treasury stock, shares | 24,850,484 | 24,721,372 | 24,672,932
Treasury stock, acquisition of shares | 129,112 | 48,440 | 701,410

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- Definition Shares of stock issued during the period as a result of the conversion of restricted stock units which represented share based compensation. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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