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, 2018
Dec. 31, 2017
Dec. 31, 2016
Gross unrecognized tax benefits      
Balance at the beginning of the year $ 7,430 $ 6,903  
Increase related to current year tax positions 419 527  
Balance at the end of the year 7,849 7,430 $ 6,903
Unrecognized tax benefits, if recognized, would result in adjustments to other tax accounts, primarily deferred taxes 6,800 $ 5,800  
Income tax benefit 0    
Tax positions subject to interest or penalties $ 0    
Federal statutory tax rate (as a percent) 21.00% 34.00% 34.00%
Provisional deferred tax expense   $ 117,300