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Debt - Convertible Debt (Details) - Convertible Debt [Member]	9 Months Ended
	Sep. 30, 2018 USD ($)	Aug. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Outstanding Balance	$ 402,500,000		$ 1,000,000,000
Unamortized discount	4,382,000		$ 7,782,000
2018 Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding Balance		$ 597,500,000
Interest Rate		3.00%
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding Balance	402,500,000
Carrying value conversion options in additional paid-in capital	(12,800,000)
Unamortized discount	$ 4,400,000
Remaining amortization period	2 years 2 months 12 days
Interest Rate	3.75%
Conversion Rate	0.0667249
Amount of General Partner OP Units per principal amount	$ 1,000