Segments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information
Non-cash stock compensation			$ 820	$ 832
General and Administrative Expense
Segment Reporting Information
Non-cash stock compensation	$ 200	$ 200	700	600
General contracting and real estate services
Segment Reporting Information
Non-cash stock compensation	100	100	200	400
General contracting and real estate services
Segment Reporting Information
General contracting and real estate services revenues	20,654	56,671	43,704	120,190
General contracting and real estate services expenses	20,087	54,015	42,501	115,211
General contracting and real estate services \| General contracting and real estate services \| Intercompany Eliminations
Segment Reporting Information
General contracting and real estate services revenues	34,200	11,600	60,100	17,500
General contracting and real estate services expenses	$ 33,900	$ 11,600	$ 59,500	$ 17,300

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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