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Debt - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 01, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 22, 2017
Jan. 27, 2017
Debt Instrument [Line Items]                  
Long-term debt   $ 2,924,340,000     $ 2,924,340,000   $ 2,919,185,000    
Debt discount paid         0 $ 1,689,000      
Repayment of outstanding borrowings         0 (703,527,000)      
Loss on extinguishments and modification of debt   0 $ (1,435,000)   0 $ (20,487,000)      
Proceeds Received From FCC Spectrum Auction             191,000,000    
Dreamcatcher Stations                  
Debt Instrument [Line Items]                  
Repayment of outstanding borrowings     (12,600,000)            
Proceeds Received From FCC Spectrum Auction     21,000,000       26,000,000    
Senior Secured Credit Agreement                  
Debt Instrument [Line Items]                  
Standby letters of credit outstanding   20,000,000     20,000,000   21,000,000    
Senior Secured Credit Agreement | Term B Loans                  
Debt Instrument [Line Items]                  
Long-term debt   188,197,000     188,197,000   187,725,000    
Debt instrument, face amount   190,000,000     190,000,000   190,000,000    
Debt instrument, unamortized discount and debt issuance costs   1,428,000     1,428,000   1,900,000    
Senior Secured Credit Agreement | Term C Loans                  
Debt Instrument [Line Items]                  
Long-term debt   1,646,706,000     1,646,706,000   1,644,109,000    
Debt instrument, face amount   1,666,000,000     1,666,000,000   1,666,000,000    
Debt instrument, unamortized discount and debt issuance costs   19,186,000     19,186,000   21,783,000    
Discount issued                 $ 4,000,000
Debt discount paid       $ 13,000,000          
Payment of debt issuance costs, deferred                 $ 1,000,000
Senior Secured Credit Agreement | Term Loan Facility                  
Debt Instrument [Line Items]                  
Debt instrument, unamortized discount and debt issuance costs   21,000,000     21,000,000   24,000,000    
Payments of Debt Restructuring Costs       12,000,000          
Senior Secured Credit Agreement | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Revolving credit facility borrowings outstanding   0     0   0    
Borrowing capacity under senior secured credit facility   420,000,000     420,000,000   420,000,000    
Amended Secured Credit Facility                  
Debt Instrument [Line Items]                  
Loss on extinguishments and modification of debt     1,000,000 19,000,000          
Amended Secured Credit Facility | Term B Loans                  
Debt Instrument [Line Items]                  
Repayment of outstanding borrowings $ (400,000,000)                
Write off of Deferred Debt Issuance Cost       6,000,000          
Debt Instrument, Unamortized Discount Write-off on Extinguishment       $ 1,000,000          
Amended Secured Credit Facility | Term Loan Facility                  
Debt Instrument [Line Items]                  
Repayment of outstanding borrowings     $ (102,000,000)       (102,000,000)    
5.875% Senior Notes due 2022 | Senior Notes                  
Debt Instrument [Line Items]                  
Long-term debt   1,089,437,000     1,089,437,000   1,087,351,000    
Debt instrument, face amount   $ 1,100,000,000     $ 1,100,000,000        
Stated interest rate   5.875%     5.875%        
Debt issuance costs   $ 10,563,000     $ 10,563,000   $ 12,649,000    
Debt Instrument, Consent Vote Percentage               93.23%