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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, 2017
Sep. 30, 2017
Mar. 07, 2017
Dec. 31, 2016
Fair Value Measurements            
Price per share (in dollars per share)     $ 45.65      
Debt Instrument, Convertible, Conversion Premium, Shares     10,000      
Estimated conversion value     $ 300      
Payments to Acquire Businesses, Net of Cash Acquired   $ 15,000        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       $ 10,000    
Equity investments     14,146     $ 0
Investments, Contingent Purchase Obligation     $ 900      
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 [Member] | Convertible Senior Notes Due 2022 [Member] | Level 1            
Fair Value Measurements            
Long-term debt-current and long-term [1]     $ 0      
Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member] | Level 2            
Fair Value Measurements            
Long-term debt-current and long-term [1]     361,526      
Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member] | Level 3            
Fair Value Measurements            
Long-term debt-current and long-term [1]     0      
Unsecured Debt [Member] | Notes | Level 1            
Fair Value Measurements            
Long-term debt-current and long-term [2]     0      
Unsecured Debt [Member] | Notes | Level 2            
Fair Value Measurements            
Long-term debt-current and long-term [2]     644      
Unsecured Debt [Member] | Notes | Level 3            
Fair Value Measurements            
Long-term debt-current and long-term [2]     0      
Unsecured Debt [Member] | Carrying Value | Convertible Senior Notes Due 2022 [Member]            
Fair Value Measurements            
Long-term debt-current and long-term [1]     276,173      
Unsecured Debt [Member] | Carrying Value | Notes            
Fair Value Measurements            
Long-term debt-current and long-term [2]     $ 324      
[1] The closing price of the Company’s common stock was $45.65 per share at December 31, 2017 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 $45.65 per share at December 31, 2017 compared to a conversion price of $24.82 per share which, if converted, would result in a conversion premium of less than ten thousand shares of the Company’s common stock or $0.3 million of cash. The maximum conversion premium that can be due on the 2019 Notes is approximately ten thousand shares of the Company’s common stock, which assumes no increases in the conversion rate for certain corporate events.