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Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment ft	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Investigation-related matters | $	$ 1,567	$ 1,385	$ 2,606	$ 3,275
Maximum | Tubular Sales
Segment Reporting Information [Line Items]
Length of tubulars used as caissons or pilings (in feet) (up to) | ft			300

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Investigation-Related Matters Expense

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- Definition

Length of Tubulars used as Caissons and Pilings

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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