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Debt - Unsecured Term Loans (Details)	3 Months Ended
	Sep. 30, 2019 USD ($) swap	Dec. 31, 2019 USD ($)	Dec. 02, 2019	Dec. 31, 2018 USD ($)	Dec. 21, 2018 USD ($)	Dec. 03, 2018
Debt Instrument [Line Items]
Number of interest rate swaps | swap	4
Number of interest rate swaps to be terminated | swap	2
$250.0 million 5 year - variable rate | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000
Unsecured term loans		$ 50,000,000		$ 50,000,000
Stated interest rate		2.8911%		3.5493%
$250.0 million 5 year - variable rate | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000
Unsecured term loans		0		$ 26,000,000
Stated interest rate				3.6794%
$150.0 million 5.5 year - swapped to fixed rate 2.6915% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		150,000,000
Unsecured term loans		$ 50,000,000
Stated interest rate		2.6915%
$150.0 million 5.5 year - swapped to fixed rate 3.5493% | Unsecured Debt
Debt Instrument [Line Items]
Unsecured term loans				$ 50,000,000
Stated interest rate				3.5493%
$150.0 million 5.5 year - swapped to fixed rate 2.6990% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000
Unsecured term loans		$ 50,000,000
Stated interest rate		2.699%
$150.0 million 5.5 year - variable rate | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000
Unsecured term loans		$ 50,000,000		$ 26,000,000
Stated interest rate		2.8911%		3.6794%
Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount					$ 400,000,000
Unsecured term loans		$ 400,000,000		$ 352,000,000
Issuance costs, net of accumulated amortization		(2,471,000)		(3,145,000)
Term Loan | Line of Credit
Debt Instrument [Line Items]
Total debt, net		397,529,000		348,855,000
Interest Rate Swap Three | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Stated interest rate	2.6795%
Notional amount	$ 100,000,000
Interest Rate Swap Five | $150.0 million 5.5 year - swapped to fixed rate 2.6915% | Unsecured Debt
Debt Instrument [Line Items]
Stated interest rate	2.6915%
Notional amount	$ 50,000,000
Interest Rate Swap Six | $150.0 million 5.5 year - swapped to fixed rate 2.6990% | Unsecured Debt
Debt Instrument [Line Items]
Stated interest rate	2.699%
Interest Rate Swap One | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		250,000,000
Unsecured term loans		$ 100,000,000
Stated interest rate		2.6795%
Interest Rate Swap One | $250.0 million 5 year - swapped to fixed rate 2.5510% | Unsecured Debt
Debt Instrument [Line Items]
Unsecured term loans		$ 90,000,000		$ 90,000,000
Stated interest rate		2.551%		2.551%
Notional amount		$ 90,000,000
Interest Rate Swap One | $250.0 million 5 year - variable rate | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, derivative			1.20%			1.20%
Interest Rate Swap One | $250.0 million 5 year - variable rate | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, derivative					1.20%
Interest Rate Swap One | Term Loan | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate, derivative		1.20%
Interest Rate Swap Two | $250.0 million 5 year - swapped to fixed rate 2.6795% | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000
Unsecured term loans		$ 100,000,000
Stated interest rate		2.6795%
Interest Rate Swap Two | $250.0 million 5 year - swapped to fixed rate 2.5525% | Unsecured Debt
Debt Instrument [Line Items]
Unsecured term loans		$ 60,000,000		$ 60,000,000
Stated interest rate		2.5525%		2.5525%
Notional amount		$ 60,000,000

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