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Debt - 2021 Activity (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 25, 2021	Feb. 05, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Apr. 17, 2020
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount			$ 463,100		$ 463,100
Assumption of mortgage notes					5,103	$ 0
Debt Instrument, Unamortized Discount (Premium), Net			134		$ 134		$ (29)
Debt Instrument, Covenant Compliance					The Company was in compliance with all financial and other covenants		The Company was in compliance with all financial and other covenants
Net book value of properties that are collateral for debt arrangements			89,300		$ 89,300		$ 81,400
Long-term debt, gross			1,890,114		$ 1,890,114		$ 1,709,102
Fair Value, Nonrecurring
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.10%
Ronkonkoma, NY, 2-25-21
Debt Instrument [Line Items]
Assumption of mortgage notes	$ 5,100
Unsecured Credit Facility
Debt Instrument [Line Items]
Debt Issuance Costs, Gross		$ 1,200
Unsecured Credit Facility | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.90%
Interest Expense [Member]
Debt Instrument [Line Items]
Amortization of deferred financing fees			789	$ 746	$ 1,276	1,422
Line of Credit Facility, Commitment Fee Amount			440	316	826	680
Accounts Payable and Accrued Liabilities [Member]
Debt Instrument [Line Items]
Interest payable			$ 6,300	$ 6,300	6,300	$ 6,300
United of Omaha Life Insurance Company | Ronkonkoma, NY, 2-25-21
Debt Instrument [Line Items]
Assumption of mortgage notes	5,100
Debt Instrument, Unamortized Discount (Premium), Net	$ 200
$300 Million Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost					700
Debt Issuance Costs, Gross		$ 1,600
Deferred Financing Accrued Extension Fee								$ 1,100
$300 Million Unsecured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Debt Instrument, Basis Spread on Variable Rate, Floor		0.00%
$300 Million Unsecured Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.85%
$300 Million Unsecured Term Loan [Member] | Minimum [Member] | Base Rate
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%
$300 Million Unsecured Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.65%
$300 Million Unsecured Term Loan [Member] | Interest Expense [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost					$ 300

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