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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, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 5,173,807
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 14.67
Unvested Options (in shares) | 3,494,615
First Vesting Date - Dec 31 2016 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,421,933
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 12.66
Unvested Options (in shares) | 561,579
First Vesting Date - Dec 31 2017 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,246,480
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 12.60
Unvested Options (in shares) | 735,744
First Vesting Date - Dec 31 2018 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,470,606
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 14.25
Unvested Options (in shares) | 1,162,504
First Vesting Date - Dec 31 2019 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,034,788
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 20.52
Unvested Options (in shares) | 1,034,788
Performance Shares | First Vesting Date - Dec 31 2015 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Granted, Net of Forfeitures (in shares) | 1,253,443
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares | $ 14.17
Unvested Options (in shares) | 136,781

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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