Construction Contracts - Summary of Net Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Contractors [Abstract]
Costs incurred on uncompleted construction contracts	$ 610,292	$ 594,006
Estimated earnings	21,100	20,375
Billings	(634,697)	(616,060)
Net position	(3,305)	(1,679)
Construction contract costs and estimated earnings in excess of billings	317	1,358
Billings in excess of construction contract costs and estimated earnings	$ (3,622)	$ (3,037)

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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