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INCOME TAXES - NOL rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Net operating losses    
Net operating losses, beginning balance $ 4,200 $ 78,100
Permanent loss of tax benefit related to NOLs limited by ownership change   (72,500)
NOL generated (utilized) (2,200) (1,700)
Other, including changes in foreign exchange rates 100 300
Net operating losses, end balance 2,100 4,200
Unremitted earnings of non-US subsidiaries 700 0
Unrecognized tax benefits 0 0
Penalties or interest 0 0
Federal    
Net operating losses    
Net operating losses, beginning balance 1,600  
Net operating losses, end balance 1,000 1,600
Foreign    
Net operating losses    
Net operating losses, beginning balance 300  
Net operating losses, end balance 100 300
State    
Net operating losses    
Net operating losses, beginning balance 2,300  
Net operating losses, end balance $ 1,000 $ 2,300