Segments - Net Income of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information
Rental revenues	$ 36,378	$ 28,598	$ 67,287	$ 57,297
Rental expenses	8,027	6,522	14,752	12,946
Real estate taxes	3,451	2,735	6,579	5,548
General contracting and real estate services
Segment Reporting Information
Segment revenues	21,444	20,654	38,480	43,704
Segment expenses	20,123	20,087	36,409	42,501
Operating Segments
Segment Reporting Information
Gross profit	26,221	19,908	48,027	40,006
Operating Segments \| Office real estate
Segment Reporting Information
Rental revenues	7,382	5,288	12,938	10,388
Rental expenses	1,853	1,430	3,339	2,876
Real estate taxes	653	502	1,179	1,004
Gross profit	4,876	3,356	8,420	6,508
Operating Segments \| Retail real estate
Segment Reporting Information
Rental revenues	19,235	16,608	36,492	33,319
Rental expenses	2,893	2,563	5,493	5,220
Real estate taxes	1,893	1,656	3,704	3,339
Gross profit	14,449	12,389	27,295	24,760
Operating Segments \| Multifamily residential real estate
Segment Reporting Information
Rental revenues	9,761	6,702	17,857	13,590
Rental expenses	3,281	2,529	5,920	4,850
Real estate taxes	905	577	1,696	1,205
Gross profit	5,575	3,596	10,241	7,535
Operating Segments \| General contracting and real estate services \| General contracting and real estate services
Segment Reporting Information
Segment revenues	21,444	20,654	38,480	43,704
Segment expenses	20,123	20,087	36,409	42,501
Gross profit	$ 1,321	$ 567	$ 2,071	$ 1,203

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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A tax based on the assessed value of real estate by the local government. The tax is usually based on the value of property (including the land).

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