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SHARE-BASED COMPENSATION - Long term equity compensation plan narrative (Details) | 12 Months Ended |
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Dec. 31, 2019 installment shares | May 31, 2017 shares
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of installments | 4 |
Vesting period | 3 years |
Restricted Stock Units | Cash Settled |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of installments | 4 |
Restricted Stock Units | Cash Settled | Cliff Vesting |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Performance Based Restricted Stock and Restricted Stock Units | Cash Settled | Cliff Vesting |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
2017 Long Term Equity Compensation Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum number of shares to be issued under the plan (in shares) | shares |  | 3,400,000
Number of awards available for grant under plan (in shares) | shares | 2,565,143 |
2007 Long-term Equity Compensation Plan | Share Settled |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Period of time subsequent to a change in control during which plan allows for accelerated vesting of awards for certain terminations | 2 years |
2007 Long-term Equity Compensation Plan | Restricted Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of installments | 4 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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