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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 01, 2017
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 22, 2017
Jan. 27, 2017
Debt Instrument [Line Items]                    
Long-term debt   $ 2,922,600,000       $ 2,922,600,000   $ 2,919,185,000    
Debt discount paid           0 $ 1,689,000      
Repayment of outstanding borrowings           0 (589,661,000)      
Loss on extinguishment and modification of debt   0   $ 0   0 $ 19,052,000      
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               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   188,038,000       188,038,000   187,725,000    
Debt instrument, face amount   190,000,000       190,000,000   190,000,000    
Debt instrument, unamortized discount and debt issuance costs   1,587,000       1,587,000   1,900,000    
Senior Secured Credit Agreement | Term C Loans                    
Debt Instrument [Line Items]                    
Long-term debt   1,645,828,000       1,645,828,000   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   20,064,000       20,064,000   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   22,000,000       22,000,000   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 extinguishment 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   1,088,734,000       1,088,734,000   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   $ 11,266,000       $ 11,266,000   $ 12,649,000    
Debt Instrument, Consent Vote Percentage                 93.23%