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Segment Information - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) segment ft	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of reportable segments | segment	4
Revenues | $	$ 522,493	$ 454,795	$ 487,531
Revenue | Customer Concentration Risk | One Customer
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Concentration risk		10.00%	13.00%
Maximum | Tubular Sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Length of tubulars used as caissons or pilings (in feet) | ft	300

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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