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DEBT (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 13, 2017
USD ($)
$ / shares
Jan. 23, 2013
USD ($)
May 31, 2017
shares
Mar. 31, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
d
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
Mar. 07, 2017
$ / shares
May 02, 2012
shares
Debt:                      
Settlement Period - Convertible Debt Conversion Request         40 days            
Share Price | $ / shares           $ 45.65          
Debt Instrument Conversion Obligation Number of Trading Days Prior to Date on which Entity Provides Notice of Redemption         30 days            
Debt Conversion, Converted Instrument, Shares Issued | shares     10,000 2,500,000              
Debt Instrument, Convertible, Conversion Value           $ 300,000          
Loss on early extinguishment of debt       $ 3,700,000   3,732,000   $ 52,000      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger         130.00%            
Debt Instrument, Convertible, Threshold Trading Days | d         20            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares                     162,885
Convertible Senior Notes Due 2022 [Member]                      
Debt:                      
Debt Instrument, Convertible, Conversion Ratio 14.9491                    
Debt Instrument, Convertible, Conversion Price | $ / shares $ 66.89                    
Debt Instrument, Conversion Obligation Premium on Common Stock 37.50%                    
Share Price | $ / shares                   $ 48.65  
Debt Redemption Price Due to Fundamental Change as Percentage of Principal Amount 100.00%                    
Convertible Debt $ 274,100,000                    
Debt Instrument, Convertible, Assumed Borrowing Rate 7.45%                    
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 70,900,000                    
Debt Related Commitment Fees and Debt Issuance Costs $ 11,000,000                    
Debt Issuance Costs, Amortization period 5 years                    
Debt Instrument, Customary Events of Default, Percentage of Principal and Accrued and Unpaid Interest Due and Payable Upon Default 100.00%                    
Convertible Senior Notes Due 2022 [Member] | Debt Conversion Terms Business Day Immediately Preceding October 1, 2021 [Member]                      
Debt:                      
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days 20 days                    
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days 30 days                    
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price 130.00%                    
Debt Instrument Conversion Obligation Number of Consecutive Business Days after Consecutive Trading Day Period 5 days                    
Debt Instrument, Conversion Obligation Period of Consecutive Trading Days 5 days                    
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock $ 1,000         1,000          
Debt Instrument, Conversion Obligation Trading Price as Percentage of Product of Last Reported Common Stock Sale Price and Conversion Rate Maximum 98.00%                    
Debt Instrument, Market Price           $ 1,048          
Convertible Senior Notes Due 2022 [Member] | Debt Redemption Terms on or after April 1, 2020 [Member]                      
Debt:                      
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days 20 days                    
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days 30 days                    
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price 130.00%                    
Debt Instrument Conversion Obligation 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%                    
Two Thousand Nineteen Senior Convertible Notes [Member]                      
Debt Instrument [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage   3.25%       3.25%          
Debt:                      
Amortization of Debt Issuance Costs           $ 1,381,000 $ 612,000 $ 615,000      
Total debt, net of debt discount                 $ 300,000    
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock         $ 1,000            
Debt Instrument, Convertible, Conversion Price | $ / shares           $ 24.82          
Gross Proceeds From Issuance of Debt   $ 120,000,000                  
Debt Instrument, Repurchased Face Amount       117,700,000         500,000    
Debt Instrument, Repurchase Amount       $ 118,200,000         $ 500,000    
Repayments of Debt         $ 300,000            
Two Thousand Nineteen Senior Convertible Notes [Member] | Debt Conversion Terms Business Day Immediately Preceding August 12018 [Member]                      
Debt:                      
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock           $ 1,000          
Debt Instrument, Market Price           1,905          
Debt Instrument, Convertible, Conversion Value           1,839          
Unsecured Debt [Member] | Convertible Senior Notes Due 2022 [Member]                      
Debt Instrument [Line Items]                      
Proceeds from Issuance of Debt $ 345,000,000                    
Debt Instrument, Interest Rate, Stated Percentage 2.375%                    
Debt:                      
Long-term Debt, Gross           345,000,000 0        
Debt Issuance Costs, Net           (7,482,000) 0        
Discount on debt           (61,345,000) 0        
Total debt, net of debt discount           276,173,000 0        
Proceeds from Convertible Debt, Net $ 334,000,000                    
Unsecured Debt [Member] | Two Thousand Nineteen Senior Convertible Notes [Member]                      
Debt:                      
Long-term Debt, Gross           338,000 118,531,000        
Debt Issuance Costs, Net           (2,000) (1,276,000)        
Discount on debt           (12,000) (8,517,000)        
Total debt, net of debt discount           $ 324,000 $ 108,738,000