Derivative Instruments - Fair Value of Interest Rate Swaps (Details) - Interest Rate Swap - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Nov. 30, 2019	Mar. 29, 2018	Sep. 15, 2015
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)	$ (12,372,000)	$ 1,823,000
2015 Term Loan
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	150,000,000				$ 150,000,000.0
2015 Term Loan | Accounts Payable and Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)	(1,005,000)	(62,000)
2018 Term Loan A
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	150,000,000.0			$ 150,000,000.0
2018 Term Loan A | Accounts Payable and Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)	(4,471,000)
2018 Term Loan A | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)		1,825,000
2018 Term Loan B
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	100,000,000.0			$ 100,000,000.0
2018 Term Loan B | Accounts Payable and Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)	(6,896,000)	(3,664,000)
Forward Swaps for future fixed-rate debt
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount		200,000,000	$ 200,000,000.0
Forward Swaps for future fixed-rate debt | Accounts Payable and Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)	$ 0
Forward Swaps for future fixed-rate debt | Prepaid Expenses and Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets (Liabilities)		$ 3,724,000