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NONVESTED SHARES (Details) - 2008 Plan - Nonvested shares - shares
12 Months Ended
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