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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | $ 0 | $ 196,001 | $ 80,797
Business Acquisition, Transaction Costs |  |  |  |  |  |  | $ 760 | $ 2,240 |
TEW Plus LTD [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Nov. 23, 2015 |  |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | TEW Plus, Ltd ("Tew Plus") |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 2,130 |  |  |  |  |  |  |  |
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. ("IOS") |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | $ 167,404 |  |  |  |  |  |  |
Working capital adjustment |  | 2,363 |  |  |  |  |  |  |
Earn out provision |  | 60,000 |  |  |  |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  | $ 7,600 |  |  |  |  |  |  |
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 |  |  |  |  |  |
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, LLC ("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 |  |  |  |  |
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 |  |  |  |
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 |  |  |

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