Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories in the accompanying Condensed Consolidated Balance Sheets consisted of the following amounts (in thousands):

	September 30, 2017		December 31, 2016
Raw materials and construction materials	$	25,709	$	21,997
Work in process	17,944		15,429
Inventories	$	43,653	$	37,426