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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2015 | Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014 | Jun. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | $ 193,871 | $ 495
Acquisition related costs |  |  |  |  |  | $ 225 | $ 595 |
Inspection Oilfield Services (IOS) [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Mar. 13, 2015 |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | IOS Holdings, Inc. |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 167,404 |  |  |  |  |  |  |
Working capital adjustment | 2,363 |  |  |  |  |  |  |
Earn out provision proceeds | 60,000 |  |  |  |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date | 7,600 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 168,704 |  |  |  |  |  |  |
Tew Holdings, LTD [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Jan. 13, 2015 |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  | Tew Holdings, LTD (Tew) |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 26,467 |  |  |  |  |  |
Working capital adjustment |  | 4,200 |  |  |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  | 600 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | $ 30,878 |  |  |  |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Dec. 30, 2014 |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  | Chemtec Energy Services, L.L.C. (Chemtec) |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 66,719 |  |  |  |  |
Working capital adjustment |  |  | 1,867 |  |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  | 5,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | $ 68,909 |  |  |  |  |
FWO [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Oct. 29, 2014 |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | FWO |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 1,103 |  |  |  |
Working capital adjustment |  |  |  | 161 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | $ 1,103 |  |  |  |
Carr Concrete [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Jul. 07, 2014 |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  |  | Carr Concrete Corporation (Carr) |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 12,480 |  |  |
Working capital adjustment |  |  |  |  | 189 |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  |  |  | 1,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  | $ 12,480 |  |  |

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