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INCOME TAXES - Components of Income Tax - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating loss carryforwards      
Effective tax rate (as a percent) 67.60% 35.10%  
Increase unrecognized tax benefits $ 3,900 $ 10,600  
Net increase for permanently non-deductible expenses 3,800    
Income tax benefit from investment tax credit 1,215    
Benefit (net) to record a return to accrual adjustment   4,700  
Benefit to recognize a capital loss carryover due to capital gains   1,200  
Benefit (net) to record the change in valuation allowance   1,400  
Provision for the intercompany sale of assets   1,700  
Operating loss carryforward that will expire 81,300    
Operating loss carryforward with no expiration 92,300    
Valuation allowance 39,406 31,442  
Undistributed earnings of foreign subsidiaries 129,000    
Unrecognized benefits, including interest and penalties 38,600 34,700 $ 24,100
Increase from prior period positions 2,000    
Increase in unrecognized tax benefits taken during the current period 3,383 $ 3,408 $ 3,394
Settlement of prior year positions 1,500    
Federal      
Operating loss carryforwards      
Operating loss carryforwards 7,300    
State      
Operating loss carryforwards      
Operating loss carryforwards 6,100    
Foreign      
Operating loss carryforwards      
Operating loss carryforwards $ 160,200