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Long-Term Debt - Notes (Details) - USD ($)		6 Months Ended
	Mar. 21, 2019	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument
Proceeds from borrowings of long-term debt		$ 1,254,000,000	$ 383,830,000
Senior Notes | 2027 Notes
Debt Instrument
Debt instrument face amount	$ 500,000,000.0
Interest rate (as a percent)	6.875%
Proceeds from borrowings of long-term debt	$ 491,200,000
Debt issuance cost	$ 8,800,000

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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, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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