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Debt - Narrative (Details)		3 Months Ended			6 Months Ended	12 Months Ended
	Dec. 21, 2018 USD ($) option	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt, net			$ 555,109,000		$ 504,829,000	$ 555,109,000
Revolving line of credit
Debt Instrument [Line Items]
Repayments of lines of credit		$ 50,000,000	100,000,000
Mortgages payable
Debt Instrument [Line Items]
Long-term debt, net			106,728,000		106,154,000	106,728,000
Revolving line of credit
Debt Instrument [Line Items]
Outstanding borrowings			300,000,000		350,000,000	300,000,000
Revolving line of credit | Revolving line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 350,000,000
Long-term line of credit			$ 50,000,000		$ 0	$ 50,000,000
Unused commitment fee (percent)					0.15%	0.15%
Proceeds from lines of credit				$ 150,000,000
Debt instrument, term	4 years
Number of extension options | option	2
Extension option on line of credit, period	6 months
Revolving line of credit | Revolving line of credit | One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)				1.05%

X

- Definition

Line of Credit Facility, Extension Option, Period

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Line of Credit Facility, Number of Extension Options

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- Definition

Amount of short-term and long-term debt and lease obligation.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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