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DEBT (Details 2) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 13, 2017
Jan. 23, 2013
May 31, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 07, 2017
DEBT AND FINANCING OBLIGATIONS                    
Settlement period - convertible debt conversion request             40 days      
Closing sale price (in dollars per share)         $ 32.05   $ 32.05      
Estimated conversion value         $ 100,000   $ 100,000      
Shares issued to settle the conversion premium     10 2,500            
Loss on early extinguishment of debt       $ 3,700,000 0 $ 11,000 0 $ 3,732,000    
Repayments of debt             0 $ 118,191,000    
Convertible Senior Notes Due 2022                    
DEBT AND FINANCING OBLIGATIONS                    
Principal amount used for debt instrument conversion ratio         1,000   1,000      
Initial conversion rate of common stock per $1000 of principal amount of Notes (in shares) 14.9491                  
Initial conversion price of notes into common stock (in dollars per share) $ 66.89 $ 66.89                
Convertible debt, premium on common stock 37.50%                  
Closing sale price (in dollars per share)                   $ 48.65
Liability component of convertible debt $ 274,100,000                  
Convertible debt, assumed borrowing rate 7.45%                  
Convertible debt, carrying amount of equity component $ 70,900,000                  
Total transaction costs related to the issuance of Notes $ 11,000,000                  
Debt issuance costs, amortization period 5 years                  
Convertible Senior Notes Due 2022 | Conversion terms prior to close of business on business day immediately proceeding October 1, 2021                    
DEBT AND FINANCING OBLIGATIONS                    
Convertible debt, common stock closing sales price minimum, number of trading days 20 days                  
Convertible debt, number of consecutive trading days 30 days                  
Convertible debt, common stock closing sales price minimum as percentage of conversion price 130.00%                  
Principal amount used for debt instrument conversion ratio         1,000   1,000      
Market price per $1000 of principal amount of notes         934   934      
Convertible Senior Notes Due 2022 | Debt Redemption Terms on or after April 1, 2020                    
DEBT AND FINANCING OBLIGATIONS                    
Convertible debt, common stock closing sales price minimum, number of trading days 20 days                  
Convertible debt, number of consecutive trading days 30 days                  
Convertible debt, common stock closing sales price minimum as percentage of conversion price 130.00%                  
Convertible debt, number of trading days prior to date on which entity provides notice of redemption 5 days                  
Debt Instrument, Percentage of Principal Amount for Computation of Redemption Price 100.00%                  
Convertible Senior Notes Due 2019                    
DEBT AND FINANCING OBLIGATIONS                    
Initial conversion price of notes into common stock (in dollars per share)   $ 24.82                
Debt repurchased face amount       117,700,000 500,000   500,000      
Debt repurchase amount       $ 118,200,000 500,000   500,000      
Repayments of debt             300,000      
Convertible Senior Notes Due 2019 | Conversion terms, prior to close of business on business day immediately preceding August 1, 2018                    
DEBT AND FINANCING OBLIGATIONS                    
Principal amount used for debt instrument conversion ratio         1,000   1,000      
Market price per $1000 of principal amount of notes         1,320   1,320      
Estimated conversion value         1,291   1,291      
Unsecured Debt | Convertible Senior Notes Due 2022                    
DEBT AND FINANCING OBLIGATIONS                    
Debt issued in private placement $ 345,000,000                  
Stated interest rate (as a percent) 2.375%                  
Net proceeds from issuance of convertible debt $ 334,000,000                  
Convertible notes outstanding amount         $ 283,258,000   $ 283,258,000   $ 276,173,000  
Unsecured Debt | Convertible Senior Notes Due 2019                    
DEBT AND FINANCING OBLIGATIONS                    
Debt issued in private placement   $ 120,000,000                
Stated interest rate (as a percent)   3.25%     3.25%   3.25%      
Convertible notes outstanding amount         $ 330,000   $ 330,000   $ 324,000