Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Unrecognized Tax Benefits (Details)

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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits, if recognized, would affect the effective tax rate $ 600    
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits      
Balance at Beginning of Year 2,554 $ 2,554  
Additions for tax positions of prior years 594 0  
Balance at End of Year 3,148 2,554 $ 2,554
Accrued interest and penalties 900 400  
Interest and penalties $ 500 $ 100 $ 200