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Amount of lease payments to be received by lessor for operating lease.

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Amount of lease payment to be received by lessor for operating lease in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lease payment to be received by lessor for operating lease in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.

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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Minimum Lease Payments:
Remaining 2021	$ 109,270
2022	129,682
2023	115,896
2024	100,499
2025	83,365
Thereafter	288,175
Total	826,887
Disaggregation of Revenue [Line Items]
Receivables	329		$ 327
Property management fees
Disaggregation of Revenue [Line Items]
Other fee income	587	$ 577
Asset management fees
Disaggregation of Revenue [Line Items]
Other fee income	271	285
Leasing commissions and other fees
Disaggregation of Revenue [Line Items]
Other fee income	155	101
Other fee income
Disaggregation of Revenue [Line Items]
Other fee income	$ 1,013	$ 963
Minimum
Disaggregation of Revenue [Line Items]
Remaining lease term	1 year
Maximum
Disaggregation of Revenue [Line Items]
Remaining lease term	77 years