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Deferred Revenue	12 Months Ended
Deferred Revenue	Dec. 31, 2017
Deferred Revenue [Abstract]
Deferred Revenue	Deferred Revenue Deferred revenue of $10,136 and $7,597 at December 31, 2017 and 2016, respectively, consists of customer billings or payments received for which the revenue recognition criteria have not yet been met as well as billings in excess of costs on percentage of completion projects. Advanced payments from customers typically relate to contracts with respect to which the Company has significantly fulfilled its obligations, but due to the Company’s continuing involvement with the project, revenue is precluded from being recognized until title, ownership, and risk of loss have passed to the customer.