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Long-Term Debt - Notes (Details) - USD ($)			3 Months Ended
	Apr. 05, 2019	Mar. 21, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument
Proceeds from borrowings of long-term debt			$ 690,000,000	$ 155,830,000
Repayments of long-term debt			$ 629,000,000	$ 146,636,000
Senior Notes
Debt Instrument
Interest rate (as a percent)			6.00%
Senior Notes | Partnership’s 6.875% senior notes due April 2027
Debt Instrument
Debt instrument face amount		$ 500,000,000.0
Interest rate (as a percent)		6.875%	6.875%
Proceeds from borrowings of long-term debt		$ 490,900,000
Debt issuance cost		$ 9,100,000
Long term debt gross			$ 500,000,000		$ 0
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | Prior to April 1, 2022
Debt Instrument
Redemption rate (as a percent)			100.00%
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | Prior to April 1, 2022 | Conditional Event One
Debt Instrument
Redemption rate (as a percent)			106.875%
Maximum aggregate principal redemption prior to Apr.2022 (percentage)			35.00%
Minimum aggregate principal outstanding prior to Apr.2022 (percentage)			65.00%
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | On or after April 1, 2022
Debt Instrument
Redemption rate (as a percent)			105.156%
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | On or after April 1, 2023
Debt Instrument
Redemption rate (as a percent)			103.438%
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | On or after April 1, 2024
Debt Instrument
Redemption rate (as a percent)			101.719%
Senior Notes | Partnership’s 6.875% senior notes due April 2027 | Beginning on or After April 1, 2025 and any time after
Debt Instrument
Redemption rate (as a percent)			100.00%
Senior Notes | Partnership’s 6% senior notes due April 2021
Debt Instrument
Interest rate (as a percent)			6.00%
Long term debt gross			$ 350,000,000		$ 350,000,000
Senior Notes | Partnership’s 6% senior notes due April 2021 | Subsequent Event
Debt Instrument
Interest rate (as a percent)	6.00%
Repayments of long-term debt	$ 350,000,000.0
Redemption rate (as a percent)	100.00%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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