Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 1,190	$ 2,413	$ 2,380	$ 3,901
Other	1,855	2,508	3,601	5,259
Total interest expense	24,091	28,719	47,682	58,047
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	1,198	1,198	2,396	2,396
Mortgage debt
Debt Instrument [Line Items]
Interest expense, debt	0	626	0	1,252
Unsecured revolving credit facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	3,364	624	5,669	2,024
Unsecured term loan facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	$ 16,484	$ 21,350	$ 33,636	$ 43,215

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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