Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Additional Information (Details)

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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
TCJA, additional tax expense $ 11,600    
TCJA, tax on deemed repatriated earnings of foreign subsidiaries 8,000    
TCJA, remeasurement of deferred tax assets 2,900    
TCJA, reductions in tax benefits on stock compensation 700    
Valuation allowance      
Valuation allowance at beginning of year 6,507 $ 3,969  
Change in valuation allowance (6,483) 2,538  
Valuation allowance at end of year 24 6,507 $ 3,969
Foreign earnings from continuing operations before income tax 22,100 $ 6,400 $ 17,000
Foreign and state      
Valuation allowance      
Net operating loss carryforwards 148,000    
Foreign      
Valuation allowance      
Net operating loss carryforwards, valuation allowance 100    
Increase in valuation allowance, net operating losses $ 6,500