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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Credit Carryforward [Line Items]        
Income tax expense (benefit)   $ 1,067 $ (1,429) $ 24,218
Tax rate changes $ 25,500 0 27,560 0
Valuation allowance for deferred tax assets 54,224 41,905 54,224  
Increase (decrease) in valuation allowance   (12,300) 9,000 $ 44,600
Accrued interest and penalties associated with unrecognized tax benefits   1,400    
Unrecognized tax benefit that would affect the effective tax rate $ 17,100 16,100 $ 17,100  
Other assets, if unrecognized tax benefits assessed   5,300    
State        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forwards   89,700    
State | Research and development tax credits        
Tax Credit Carryforward [Line Items]        
Tax credit carryforwards   2,600    
Federal | Research and development tax credits        
Tax Credit Carryforward [Line Items]        
Tax credit carryforwards   0    
Federal        
Tax Credit Carryforward [Line Items]        
Net operating loss carry forwards   $ 4,900