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INCOME TAXES - Reconciliation of U.S. federal statutory rate (Details 1)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal statutory rate 34.00% 34.00% 34.00%
State rate, net of federal benefit 5.00% 5.00% 5.00%
Tax credits (4.00%) (4.00%) (1.00%)
Permanent adjustments (1.00%) (2.00%) (1.00%)
Reversal of reserve (47.00%)
Other 1.00%
Effective tax rate 34.00% (13.00%) 37.00%