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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]          
Domestic   $ (298) $ (65,422) $ (56,334)  
Foreign   20,105 12,546 19,860  
Income (loss) before income taxes   19,807 (52,876) (36,474)  
Income Tax Expense (Benefit), Continuing Operations [Abstract]          
Current Federal Tax Expense (Benefit)   (2,379) 458 (2,040)  
Current State and Local Tax Expense (Benefit)   (65) (614) (62)  
Current Foreign Tax Expense (Benefit)   11,497 10,574 6,063  
Current Income Tax Expense (Benefit)   9,053 10,418 3,961  
Deferred Federal Income Tax Expense (Benefit)   0 0 0  
Deferred State and Local Income Tax Expense (Benefit)   0 0 0  
Deferred Foreign Income Tax Expense (Benefit)   (2,291) 785 (680)  
Deferred Income Tax Expense (Benefit)   (2,291) 785 (680)  
Income Tax Expense (Benefit)   $ 6,762 $ 11,203 $ 3,281  
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Statutory U.S. federal tax rate 21.00% 21.00% 35.00% 35.00%  
Unrecognized tax positions   (12.40%) (2.30%) 6.50%  
Impact of foreign income   (8.80%) (8.00%) 26.90%  
Valuation allowance   (0.20%) 16.50% (73.60%)  
State taxes, net   0.30% 0.80% 0.10%  
Nondeductible royalty   3.80% (1.40%) (1.90%)  
Tax Cuts and Jobs Act   26.60% (62.70%) 0.00%  
Other, net   3.80% 0.90% (2.00%)  
Effective tax rate   34.10% (21.20%) (9.00%)  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease)   $ (100) $ 8,700    
Components of Deferred Tax Assets and Liabilities [Abstract]          
Net operating loss carryforwards   121,804 118,303    
Pension   5,718 5,462    
Inventory   4,863 4,957    
Warranty   4,376 4,847    
Employee benefits and related costs   10,006 14,061    
Prepaid royalties   4,780 4,383    
Deferred Tax Asset, Interest Limitation   4,606 0    
Other   19,360 20,930    
Deferred tax assets   175,513 172,943    
Fixed assets   (25,207) (28,769)    
Intangible assets   (3,474) (4,301)    
Other   (1,820) (1,396)    
Deferred tax liabilities   30,501 34,466    
Subtotal   145,012 138,477    
Valuation allowance   (151,554) (148,243)    
Net deferred tax liability   (6,542) (9,766)    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   2,400      
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration   119,400      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment   3,300 5,500    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic   158,100      
Deferred Tax Assets, Operating Loss Carryforwards, State and Local   239,500      
Deferred Tax Assets, Operating Loss Carryforwards, Foreign   293,700      
Unrecognized Tax Benefits, Gross   8,900 11,400 $ 16,100  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   8,900      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Balance at January 1   7,406 9,365 12,468 $ 14,698
Increases to tax positions taken during the current year   19 127 288  
Increases to tax positions taken during the prior years   0 6,045 3,201  
Decreases to tax positions taken during prior years   (1,336) (858) (5,257)  
Decreases due to lapse of statutes of limitations   (637) (297) (4)  
Settlements   0 (8,095) (476)  
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation   (5) (25)    
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation       18  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   (500) 500 400  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   2,400 $ 2,900 $ 3,600  
Internal Revenue Service (IRS) [Member]          
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities   $ 500