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CAPITAL STOCK (Details) - shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cumulative preferred stock, shares outstanding (in shares) | 0 | 0 |
Balance at beginning of period, treasury stock (in shares) | 47,630,511 |  |
Exercise of stock options (in shares) | 317,110 | 587,441 | 479,452
Balance at end of period, treasury stock (in shares) | 50,854,905 | 47,630,511 |
Shares retained after settlement of restricted stock units (in shares) | 41,128 | 73,496 |
Shares retained after settlement of performance share units (in shares) | 6,765 | 9,971 |
Outstanding Common Stock [Member] |  |  |
Balance at beginning of period, common stock (in shares) | 62,028,708 | 67,432,041 |
Exercise of stock options (in shares) | 315,171 | 580,947 |
Settlement of restricted stock units, net of 41,128 and 73,496 shares retained, respectively (in shares) | 78,310 | 145,757 |
Settlement of performance share units, net of 6,765 and 9,971 shares retained, respectively (in shares) | 11,806 | 15,956 |
Purchase of treasury shares (in shares) | (3,629,681) | (6,145,993) |
Balance at end of period, common stock (in shares) | 58,804,314 | 62,028,708 | 67,432,041
Treasury Stock [Member] |  |  |
Balance at beginning of period, treasury stock (in shares) | 47,630,511 | 42,227,178 |
Exercise of stock options (in shares) | (315,171) | (580,947) |
Settlement of restricted stock units, net of 41,128 and 73,496 shares retained, respectively (in shares) | (78,310) | (145,757) |
Settlement of performance share units, net of 6,765 and 9,971 shares retained, respectively (in shares) | (11,806) | (15,956) |
Purchase of treasury shares (in shares) | 3,629,681 | 6,145,993 |
Balance at end of period, treasury stock (in shares) | 50,854,905 | 47,630,511 | 42,227,178

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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