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LONG-TERM DEBT / INTEREST EXPENSE - Narrative (Details)
$ / shares in Units, shares in Millions
3 Months Ended 12 Months Ended
Feb. 13, 2018
USD ($)
Aug. 10, 2015
USD ($)
day
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 28, 2018
USD ($)
Mar. 04, 2016
USD ($)
Mar. 03, 2016
USD ($)
Debt Instrument                  
Term loan facility, outstanding     $ 1,297,023,000 $ 1,297,023,000 $ 1,540,453,000        
Issuance of shares associated with exchange of convertible senior notes       71,670,000 0 $ 0      
Gain related to convertible exchange debt       0 0 287,500,000      
Gain on refinancing       384,000 19,112,000 $ 7,580,000      
Revolving Credit Facility                  
Debt Instrument                  
Amount available for borrowings under credit facility     225,000,000.0 225,000,000.0       $ 300,000,000.0 $ 130,000,000.0
Credit facility, remaining borrowing capacity     219,100,000 219,100,000          
Letter of Credit                  
Debt Instrument                  
Borrowings utilized to secure letter of credit     5,900,000 5,900,000          
Term Loan Facility                  
Debt Instrument                  
Term loan facility, outstanding     1,130,320,000 1,130,320,000 1,170,486,000        
Unamortized discount     900,000 900,000 1,600,000        
Revolving Credit Facility | Revolving Credit Facility                  
Debt Instrument                  
Term loan facility, outstanding     0 0 $ 127,000,000        
Term Loan Facility Due March 2019                  
Debt Instrument                  
Term loan facility, outstanding     $ 1,131,200,000 $ 1,131,200,000          
Amended And Restated Senior Credit Facility                  
Debt Instrument                  
Interest rate     4.10% 4.10% 3.30%        
Amended And Restated Senior Credit Facility | Revolving Credit Facility                  
Debt Instrument                  
Weighted average interest rate         2.70%        
Annual commitment fee       0.50%          
Amended And Restated Senior Credit Facility | Letter of Credit                  
Debt Instrument                  
Annual fee on outstanding letters of credit       2.75%          
Notes | Notes                  
Debt Instrument                  
Term loan facility, outstanding     $ 167,988,000 $ 167,988,000 $ 245,273,000        
Principal amount   $ 287,500,000.0 188,565,000 188,565,000 287,500,000        
Interest rate   1.50%              
Convertible debt, conversion rate   0.0151156              
Convertible debt, conversion price (in dollars per share) | $ / shares   $ 66.16              
Issuance of shares associated with exchange of convertible senior notes       1,000          
Unamortized discount     18,065,000 18,065,000 $ 37,179,000        
Notes | Notes | Redemption Prior to May 15, 2010 | Debt Instrument, Conversion, Option One                  
Debt Instrument                  
Convertible debt, trading days threshold | day   20              
Convertible debt, consecutive trading days threshold | day   30              
Convertible debt, percentage of stock price trigger threshold   130.00%              
Notes | Notes | Redemption Prior to May 15, 2010 | Debt Instrument, Conversion, Option Two                  
Debt Instrument                  
Convertible debt, consecutive trading days threshold | day   10              
Convertible debt, consecutive business days threshold   5 days              
Convertible debt, ratio of trading price per $1,000 in principal amount   98.00%              
Debt Exchange Transaction On December 20 2017                  
Debt Instrument                  
Debt conversion, original debt, amount       98,900,000          
Gain related to convertible exchange debt       15,000,000          
Convertible, beneficial conversion feature       9,600,000          
Unamortized discount     1,400,000 1,400,000          
Fee amount     1,200,000 1,200,000          
Gain on refinancing     $ 11,000,000            
Debt Exchange Transaction On December 20 2017 | Class A Common Stock                  
Debt Instrument                  
Issuance of shares associated with exchange of convertible senior notes       $ 71,700,000          
Exchange of convertible senior notes (in shares) | shares       14.6          
Subsequent Event | Asset-backed Securities | Revolving Credit Facility                  
Debt Instrument                  
Principal amount             $ 100,000,000    
Subsequent Event | Term Loan Facility Due March 2019 | Term Loan Facility                  
Debt Instrument                  
Term loan facility, outstanding             151,900,000    
Amount available for borrowings under credit facility             151,900,000    
Subsequent Event | Amended Term Loan Facility Due March 2021 | Term Loan Facility                  
Debt Instrument                  
Term loan facility, outstanding             $ 704,300,000    
Subsequent Event | Series A Convertible Preferred Stock                  
Debt Instrument                  
Sale of stock, consideration received on transaction $ 300,000,000                
Harbin China Securities Agreement | Subsequent Event | Amended Term Loan Facility Due March 2021                  
Debt Instrument                  
Sale of stock, consideration received on transaction $ 100,000,000