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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 0 | $ 193,871
TEW Plus LTD [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Nov. 23, 2015 |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 75.00% |  |  |  |
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" or "test and inspection services") |  |  |
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 |  |

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