Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 2,413	$ 525	$ 3,901	$ 1,042
Other	2,508	360	5,259	802
Total interest expense	28,719	10,816	58,047	20,627
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	1,198	1,092	2,396	2,290
Mortgage loans
Debt Instrument [Line Items]
Interest expense, debt	626	650	1,252	1,297
Unsecured revolving credit facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	624	2,375	2,024	3,860
Unsecured term loan facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	$ 21,350	$ 5,814	$ 43,215	$ 11,336

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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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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