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FINANCIAL INSTRUMENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 13, 2017
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 07, 2017
Fair Value Measurements            
Price per share (in dollars per share)     $ 43.02      
Debt Instrument, Convertible, Conversion Premium, Shares     10,000      
Estimated conversion value     $ 200      
Payments to Acquire Businesses, Net of Cash Acquired   $ 15,000        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         $ 10,000  
Equity investment     14,146 $ 14,146    
Investments, Contingent Purchase Obligation     900      
Level 2            
Fair Value Measurements            
Cost     277,079 317,722    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax     5 0    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax     (285) (454)    
Available-for-sale Securities     $ 276,799 317,268    
Convertible Senior Notes Due 2022 [Member]            
Fair Value Measurements            
Price per share (in dollars per share)           $ 48.65
Initial conversion price of notes into common stock (in dollars per share) $ 66.89          
Notes            
Fair Value Measurements            
Initial conversion price of notes into common stock (in dollars per share)     $ 24.82      
Maximum            
Fair Value Measurements            
Debt Instrument, Convertible, Conversion Premium, Shares     10,000      
Maximum | Convertible Senior Notes Due 2022 [Member]            
Fair Value Measurements            
Debt Instrument, Convertible, Conversion Premium, Shares 5,200,000          
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 1            
Fair Value Measurements            
Long-term debt-current and long-term [1]     $ 0      
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 2            
Fair Value Measurements            
Long-term debt-current and long-term [1]     344,353      
Unsecured Debt | Convertible Senior Notes Due 2022 [Member] | Level 3            
Fair Value Measurements            
Long-term debt-current and long-term [1]     0      
Unsecured Debt | Notes | Level 1            
Fair Value Measurements            
Long-term debt-current and long-term [2]     0      
Unsecured Debt | Notes | Level 2            
Fair Value Measurements            
Long-term debt-current and long-term [2]     586      
Unsecured Debt | Notes | Level 3            
Fair Value Measurements            
Long-term debt-current and long-term [2]     0      
Unsecured Debt | Carrying Value | Convertible Senior Notes Due 2022 [Member]            
Fair Value Measurements            
Long-term debt-current and long-term [1]     290,592      
Unsecured Debt | Carrying Value | Notes            
Fair Value Measurements            
Long-term debt-current and long-term [2]     338      
Long-term:            
Fair Value Measurements            
Cost     25,882      
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax     5      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax     (16)      
Long-term: | Level 2            
Fair Value Measurements            
Cost       60,266    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax       0    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax       (219)    
Available-for-sale Securities     25,871 60,047    
Long-term: | Asset-backed Securities            
Fair Value Measurements            
Cost     9,383 23,836    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax     5 0    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax     0 (79)    
Long-term: | Asset-backed Securities | Level 2            
Fair Value Measurements            
Available-for-sale Securities     9,388 23,757    
Long-term: | Corporate bonds            
Fair Value Measurements            
Cost     16,499      
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax     0      
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax     (16)      
Long-term: | Corporate bonds | Level 2            
Fair Value Measurements            
Cost       36,430    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax       0    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax       (140)    
Available-for-sale Securities     $ 16,483 $ 36,290    
[1] The closing price of the Company’s common stock was $43.02 per share at December 31, 2018 compared to a conversion price of $66.89 per share. Currently, the conversion price is above the stock price. The maximum conversion premium that can be due on the 2022 Notes is approximately 5.2 million shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.
[2] The closing price of the Company’s common stock was $43.02 per share at December 31, 2018 compared to a conversion price of $24.82 per share which, if converted, would have resulted in an approximate conversion premium of fewer than 10,000 shares of the Company’s common stock or $0.2 million of cash. The maximum conversion premium that can be due on the 2019 Notes is approximately 10,000 shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.