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Segment Information - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment ft | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 4 |  |
Revenues | $ 118,322 | $ 108,083 | $ 117,659 | $ 110,731 | $ 107,985 | $ 105,114 | $ 120,946 | $ 153,486 | $ 454,795 | $ 487,531 | $ 974,600
Geographic Concentration Risk | United States and United Arab Emirates |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 140,400
Revenue | Customer Concentration Risk | One Customer |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk, percent |  |  |  |  |  |  |  |  | 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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