Amount of amortization expense attributable to debt issuance costs.

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Amount of the total principal payments made during the annual reporting period.

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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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Amount, after accumulated amortization, of debt discount.

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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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Gross amount of debt extinguished.

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Debt Instrument, Floor Interest Rate

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Debt Issuance Costs, Capitalized

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Debt and Financing - Term Loan Amendment (Details) - Term Loan - USD ($)		3 Months Ended	9 Months Ended
	Jul. 26, 2017	Sep. 30, 2017	Sep. 30, 2017	Jul. 25, 2017
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floor interest rate		1.00%	1.00%
Basis spread on variable rate			8.50%
Amendment No. 4
Debt Instrument [Line Items]
Face amount	$ 600,000,000
Annual principal payments, percent	3.00%			1.00%
Annual principal payment	$ 35,200,000
Unamortized discount	9,700,000
Third party costs	8,100,000
Extinguishment of debt, amount	$ 1,500,000
Debt issuance costs, capitalized		$ 1,400,000
Amendment No. 4 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floor interest rate	1.00%
Basis spread on variable rate	8.50%
Amendment No. 4 \| Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate	6.50%
Other, Net \| Amendment No. 4
Debt Instrument [Line Items]
Amortization of debt issuance costs		$ 6,700,000