Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Payment of debt issuance costs, deferred

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

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Debt - Narrative (Details)			3 Months Ended			6 Months Ended	9 Months Ended
Debt - Narrative (Details)	Feb. 01, 2017 USD ($)	Jan. 27, 2017 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 22, 2017	Dec. 31, 2016 USD ($)	Jun. 24, 2015 USD ($)
Debt Instrument [Line Items]
Long-term debt			$ 2,917,454,000				$ 2,917,454,000			$ 3,411,551,000
Debt discount paid							1,689,000	$ 784,000
Repayment of outstanding borrowings							(703,527,000)	(20,881,000)
Loss on extinguishments and modification of debt			(1,435,000)		$ 0		(20,487,000)	$ 0
Dreamcatcher Stations
Debt Instrument [Line Items]
Repayment of outstanding borrowings			(12,600,000)
Proceeds Received From FCC Spectrum Auction			21,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Rate Swap
Debt Instrument [Line Items]
Derivative, Notional Amount		$ 500,000,000
Senior Secured Credit Agreement
Debt Instrument [Line Items]
Standby letters of credit outstanding			21,000,000				21,000,000			23,000,000
Senior Secured Credit Agreement \| Term B Loans
Debt Instrument [Line Items]
Debt instrument, face amount		600,000,000								2,343,000,000
Long-term debt			187,566,000				187,566,000			2,312,218,000
Repayment of outstanding borrowings			(10,000,000)
Debt instrument, unamortized discount and debt issuance costs			2,059,000				2,059,000			31,230,000
Senior Secured Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity under senior secured credit facility		$ 420,000,000								300,000,000
Revolving credit facility borrowings outstanding			0				0			0
Leverage ratio, not to exceed		5.25
Debt issuance costs		$ 2,000,000
Senior Secured Credit Agreement \| Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Base rate floor		0.00%
Basis spread on variable rate		3.00%
Senior Secured Credit Agreement \| Revolving Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Senior Secured Credit Agreement \| Revolving Credit Facility \| Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Senior Secured Credit Agreement \| Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Senior Secured Credit Agreement \| Term C Loans
Debt Instrument [Line Items]
Long-term debt		$ 1,761,000,000	1,643,239,000				1,643,239,000			0
Premium payable on voluntary prepayments, percent		1.00%
Debt Instrument, Percent to Trigger Required Testing		35.00%
Discount issued		$ 4,000,000
Debt discount paid				$ 13,000,000
Payment of debt issuance costs, deferred		$ 1,000,000
Repayment of outstanding borrowings			(91,000,000)
Debt instrument, unamortized discount and debt issuance costs			22,653,000				22,653,000
Senior Secured Credit Agreement \| Term C Loans \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Base rate floor		0.75%
Basis spread on variable rate		3.00%
Senior Secured Credit Agreement \| Term C Loans \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Senior Secured Credit Agreement \| Term C Loans \| Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Senior Secured Credit Agreement \| Term C Loans \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Senior Secured Credit Agreement \| Term Loan Facility
Debt Instrument [Line Items]
Payments of Debt Restructuring Costs				12,000,000
Debt instrument, unamortized discount and debt issuance costs			25,000,000				25,000,000			31,000,000
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]
Debt issuance costs		$ 25,000,000
Discount issued		$ 6,000,000
Repayment of outstanding borrowings			(102,000,000)
5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Debt Instrument, Period of Outstanding Principal Amount Prior to Maturity		91 days
5.875% Senior Notes due 2022 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount											$ 1,100,000,000
Long-term debt			$ 1,086,649,000				$ 1,086,649,000			$ 1,084,563,000
Debt Instrument, Long-term Debt Amount to Extend Maturity		$ 600,000,000
Stated interest rate			5.875%				5.875%			5.875%	5.875%
Debt issuance costs			$ 13,351,000				$ 13,351,000			$ 15,437,000
Debt discount paid						$ 1,000,000
Debt Instrument, Consent Vote Percentage									93.23%