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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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