Business Acquisition - (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 08, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisitions
Contingent consideration (earn-out)				$ 2,418	$ 1,818
Net income (loss)		$ 2,999	$ 647	$ 656	$ 3,086
Oakdale-Hampton Homes
Business Acquisitions
Acquisition price	$ 44,841
Consideration held as security	600
Earn-out | Oakdale-Hampton Homes
Business Acquisitions
Contingent consideration (earn-out)	$ 2,418