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Acquisitions (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition |  |  |  |  |  |
Payment to acquire business, net of cash acquired |  |  |  | $ 0 | $ 0 | $ 196,001,000
Business acquisition cost |  |  |  | $ 0 | $ 0 | $ 760,000
TEW Plus LTD |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
Acquisition date | Nov. 23, 2015 |  |  |  |  |
Percentage of voting interests acquired | 75.00% |  |  |  |  |
Name of acquired entity | TEW Plus, Ltd (“Tew Plus”) |  |  |  |  |
Payment to acquire business, net of cash acquired | $ 2,130,000 |  |  |  |  |
Inspection Oilfield Services (IOS) |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
Acquisition date |  | Mar. 13, 2015 |  |  |  |
Name of acquired entity |  | IOS Holdings, Inc. (“IOS” or ”Test and Inspection Services”) |  |  |  |
Payment to acquire business, net of cash acquired |  | $ 167,404,000 |  |  |  |
Working capital adjustment |  | 2,363,000 |  |  |  |
Earn out provision |  | 60,000,000 |  |  |  |
Indemnified assets |  | $ 7,600,000 |  |  |  |
TEW Holdings, LTD |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
Acquisition date |  |  | Jan. 13, 2015 |  |  |
Name of acquired entity |  |  | TEW Holdings, Ltd (“Tew”) |  |  |
Payment to acquire business, net of cash acquired |  |  | $ 26,467,000 |  |  |
Working capital adjustment |  |  | 4,200,000 |  |  |
Indemnified assets |  |  | $ 600,000 |  |  |

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