Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 1,488	$ 517
Other	2,751	442
Total interest expense	29,328	9,811
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	1,198	1,198
Mortgage loans
Debt Instrument [Line Items]
Interest expense, debt	626	647
Unsecured revolving credit facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	1,400	1,485
Unsecured term loan facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	$ 21,865	$ 5,522

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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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 of the cost of borrowed funds accounted for as interest expense.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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