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, 2019
Dec. 31, 2018
Dec. 31, 2017
Gross unrecognized tax benefits      
Balance at the beginning of the year $ 7,849 $ 7,430  
Increase related to current year tax positions 509 419  
Balance at the end of the year 8,358 7,849 $ 7,430
Unrecognized tax benefits, if recognized, would result in adjustments to other tax accounts, primarily deferred taxes 7,200 $ 6,800  
Tax positions subject to interest or penalties $ 0    
Federal statutory tax rate (as a percent) 21.00% 21.00% 34.00%