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CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Stock Options Grants by First Vesting Date (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 4,122,292
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 13.20
Unvested Options (in shares) | 3,305,483
December 31, 2016 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,423,053
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 12.66
Unvested Options (in shares) | 855,984
December 31, 2017 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,253,169
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 12.60
Unvested Options (in shares) | 1,003,429
December 31, 2018 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,446,070
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 14.24
Unvested Options (in shares) | 1,446,070
Performance Shares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 2,683,996
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 12.94
Unvested Options (in shares) | 1,086,075
Performance Shares | December 31, 2014 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,412,773
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 11.83
Unvested Options (in shares) | 403,149
Performance Shares | December 31, 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,271,223
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 14.17
Unvested Options (in shares) | 682,926

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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