Debt - Convertible Debt (Details) - Convertible Debt [Member]	3 Months Ended
Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Outstanding Balance	$ 402,500,000	$ 402,500,000
Unamortized discount	3,424,000	$ 3,909,000
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	$ 3,400,000
Remaining amortization period	1 year 8 months 12 days
Conversion Rate	0.0667249
Amount of General Partner OP Units per principal amount	$ 1,000

Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature.

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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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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount (premium).

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Debt Instrument, Convertible, Conversion Ratio, Principal Amount

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