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Debt - Convertible Debt (Details) - Convertible Debt [Member]	12 Months Ended
	Dec. 31, 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	3,909,000		$ 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
Interest Rate	3.75%
Carrying value conversion options in additional paid-in capital	$ 12,800,000
Unamortized discount	$ 3,900,000
Remaining amortization period	1 year 11 months 15 days
Conversion Rate	0.0667249
Amount of General Partner OP Units per principal amount	$ 1,000