Debt - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Amortization of deferred financing fees	$ 1,518	$ 2,002	$ 3,898	$ 5,903
Other	2,547	2,415	6,148	7,674
Total interest expense	27,514	26,465	75,196	84,512
Senior unsecured notes
Debt Instrument [Line Items]
Interest expense, debt	1,198	1,198	3,594	3,594
Mortgage debt
Debt Instrument [Line Items]
Interest expense, debt	0	628	0	1,880
Unsecured revolving credit facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	2,557	903	8,226	2,927
Unsecured term loan facilities \| Unsecured debt
Debt Instrument [Line Items]
Interest expense, debt	$ 19,694	$ 19,319	$ 53,330	$ 62,534

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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