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RECENT ACCOUNTING PRONOUNCEMENTS Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Retained Earnings (Accumulated Deficit)     $ (388,226) $ (389,136)      
Contract with Customer, Liability     900        
Royalty revenue     1,850 $ 1,901 $ 2,872    
Cumulative Effect on Retained Earnings, Net of Tax $ 100 $ 300          
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax   $ 29,300          
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Retained Earnings (Accumulated Deficit)             $ 1,400
Contract with Customer, Liability             1,000
Accrued Royalties             $ 400
Royalty revenue     400        
Royalties Receivable     700        
Accrued Liabilities [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Contract with Customer, Liability     100        
Other Liabilities [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Contract with Customer, Liability     $ 800        
Scenario, Forecast | Minimum | Accounting Standards Update 2016-02              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Operating Lease, Liability           $ 35,000  
Operating Lease, Right-of-Use Asset           26,000  
Scenario, Forecast | Maximum | Accounting Standards Update 2016-02              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Operating Lease, Liability           38,000  
Operating Lease, Right-of-Use Asset           $ 29,000