The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Derivatives - Schedule of Derivative Instruments (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) instrument	Dec. 31, 2019 USD ($) instrument	Sep. 30, 2020 USD ($) instrument	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) instrument	Sep. 30, 2019 USD ($)
Derivative [Line Items]
Repayment of unsecured term loan					$ 250,000	$ 0
Interest expense			$ 21,941	$ 25,084	58,347	59,877
Two $100,000 interest rate swaps maturing in 2023
Derivative [Line Items]
Notional	$ 200,000		$ 200,000		$ 200,000
Fixed interest rate (as a percent)	2.85%		2.85%		2.85%
Three $40,000 interest rate swaps maturing in 2024
Derivative [Line Items]
Notional	$ 120,000		$ 120,000		$ 120,000
Fixed interest rate (as a percent)	1.68%		1.68%		1.68%
Three $50,000 interest rate swaps maturing in 2026
Derivative [Line Items]
Notional	$ 150,000		$ 150,000		$ 150,000
Fixed interest rate (as a percent)	1.77%		1.77%		1.77%
Cash flow hedges \| Interest rate swaps
Derivative [Line Items]
Number of instruments \| instrument	8	11	8		8
Amount expected to be reclassified to interest expense over the next 12 months	$ 10,927
Notional	470,000	$ 720,000	$ 470,000		$ 470,000
Fair value of derivative liability	$ 34,804	12,288	34,804		34,804
Interest expense			$ 21,941	$ 25,084	$ 58,347	$ 59,877
Cash flow hedges \| Two $100,000 interest rate swaps maturing in 2023
Derivative [Line Items]
Number of instruments \| instrument	2		2		2
Notional	$ 200,000		$ 200,000		$ 200,000
Fixed interest rate (as a percent)	2.85%		2.85%		2.85%
Cash flow hedges \| Three $40,000 interest rate swaps maturing in 2024
Derivative [Line Items]
Number of instruments \| instrument	3		3		3
Notional	$ 120,000		$ 120,000		$ 120,000
Fixed interest rate (as a percent)	1.68%		1.68%		1.68%
Cash flow hedges \| Three $50,000 interest rate swaps maturing in 2026
Derivative [Line Items]
Number of instruments \| instrument	3		3		3
Notional	$ 150,000		$ 150,000		$ 150,000
Fixed interest rate (as a percent)	1.77%		1.77%		1.77%
Cash flow hedges \| Two $100,000 and one $50,000 interest rate swaps maturing in 2021
Derivative [Line Items]
Number of instruments \| instrument	3		3		3
Notional	$ 250,000		$ 250,000		$ 250,000
Fair value of derivative liability	$ 1,699		1,699		$ 1,699
Interest expense			451
LIBOR
Derivative [Line Items]
Reference rate for variable interest rate	LIBOR
LIBOR \| Two $100,000 interest rate swaps maturing in 2023
Derivative [Line Items]
Reference rate for variable interest rate	LIBOR
LIBOR \| Three $40,000 interest rate swaps maturing in 2024
Derivative [Line Items]
Reference rate for variable interest rate	LIBOR
LIBOR \| Three $50,000 interest rate swaps maturing in 2026
Derivative [Line Items]
Reference rate for variable interest rate	LIBOR
LIBOR \| Cash flow hedges
Derivative [Line Items]
Reference rate for variable interest rate	one-month floating rate LIBOR
Unsecured credit facility term loan due 2021
Derivative [Line Items]
Repayment of unsecured term loan			$ 250,000
Unsecured credit facility term loan due 2021 \| Two $100,000 and one $50,000 interest rate swaps maturing in 2021
Derivative [Line Items]
Notional		$ 250,000
Fixed interest rate (as a percent)		2.00%
Unsecured credit facility term loan due 2021 \| LIBOR
Derivative [Line Items]
Reference rate for variable interest rate			LIBOR
Unsecured credit facility term loan due 2021 \| LIBOR \| Two $100,000 and one $50,000 interest rate swaps maturing in 2021
Derivative [Line Items]
Reference rate for variable interest rate		LIBOR