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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Stock-based compensation) (Details) | 12 Months Ended
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Dec. 31, 2020 share_based_compensation_plan shares
Employee stock-based compensation programs |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stockholder-approved plans | 3
Employee stock-based compensation programs | Restricted shares and restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Graded vesting period | 5 years
Employee stock-based compensation programs | Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award expiration term | 10 years
Director plans |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stockholder-approved plans | 2
Director plans | Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Award expiration term | 10 years
2017 Non-Employee Director Equity Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Graded vesting period | 1 year
2020 Long-Term Incentive Plan and the 2017 Non-Employee Director Equity Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares available for future grant (shares) | shares | 11,085,553

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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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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