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NONVESTED SHARES (Details) - 2008 Plan - Nonvested shares - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Nonvested shares |  |  |  |  |  |  |
Nonvested shares granted | 1,829,000 | 244,000 | 272,000 | 296,000 | 3,154,800 | 2,800,300 | 711,571
Vesting period |  | 4 years | 4 years |  |  |  |
Minimum |  |  |  |  |  |  |
Nonvested shares |  |  |  |  |  |  |
Vesting period |  |  |  | 3 months | 3 months | 3 years | 2 years
Maximum |  |  |  |  |  |  |
Nonvested shares |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years | 4 years | 4 years | 4 years
Vest immediately |  |  |  |  |  |  |
Nonvested shares |  |  |  |  |  |  |
Nonvested shares granted | 1,549,000 |  |  |  |  |  |
Vest over a period of two years |  |  |  |  |  |  |
Nonvested shares |  |  |  |  |  |  |
Nonvested shares granted | 280,000 |  |  |  |  |  |
Vesting period | 2 years |  |  |  |  |  |

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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