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DEBT (Details 2)
$ / shares in Units, shares in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 13, 2017
USD ($)
$ / shares
Feb. 01, 2017
d
Jan. 23, 2013
USD ($)
$ / shares
May 31, 2017
shares
Mar. 31, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
d
$ / shares
Jun. 30, 2016
USD ($)
Mar. 07, 2017
$ / shares
Dec. 31, 2016
USD ($)
DEBT AND FINANCING OBLIGATIONS                      
Closing sale price (in dollars per share) | $ / shares           $ 47.7   $ 47.7      
Estimated conversion value           $ 300,000   $ 300,000      
Convertible debt, number of trading days prior to date on which entity provides notice of redemption   30 days           30 days      
Shares issued to settle the conversion premium | shares       10 2,500            
Loss on early extinguishment of debt         $ 3,700,000 11,000 $ 0 $ 3,732,000 $ 0    
Convertible debt, threshold percentage of stock price trigger               130.00%      
Convertible debt, threshold trading days | d               20      
Repayments of debt               $ 118,191,000 $ 4,000    
Convertible Senior Notes Due 2022                      
DEBT AND FINANCING OBLIGATIONS                      
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) | $ / shares $ 66.89   $ 66.89                
Convertible debt, premium on common stock 37.50%                    
Closing sale price (in dollars per share) | $ / shares                   $ 48.65  
Debt redemption price due to fundamental change as percentage of principal amount 100.00%                    
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                    
Debt customary events of default, percentage of principal and accrued and unpaid interest due and payable upon default 100.00%                    
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%                    
Convertible debt, number of consecutive business days after consecutive trading day period 5 days                    
Convertible debt, period of consecutive trading days 5 days                    
Principal amount used for debt instrument conversion ratio $ 1,000         1,000   1,000      
Convertible debt, trading price as percentage of product of last reported common stock sale price and conversion rate maximum 98.00%                    
Market price per $1000 of principal amount of notes           1,067   1,067      
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                      
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)               40.2945      
Initial conversion price of notes into common stock (in dollars per share) | $ / shares     $ 24.82     $ 24.82   $ 24.82      
Debt repurchased face amount         117,700,000 $ 500,000   $ 500,000      
Debt repurchase amount         $ 118,200,000 500,000   500,000      
Convertible notes outstanding amount           300,000   300,000      
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           1,923   1,923      
Estimated conversion value           1,922   1,922      
Convertible Senior Notes Due 2019 | Debt Redemption Terms on or after February 1, 2017                      
DEBT AND FINANCING OBLIGATIONS                      
Convertible debt, number of trading days prior to date on which entity provides notice of redemption   5 days                  
Convertible debt, threshold percentage of stock price trigger   130.00%                  
Convertible debt, threshold trading days | d   20                  
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           269,328,000   269,328,000     $ 0
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%                
Convertible notes outstanding amount           $ 319,000   $ 319,000     $ 108,738,000