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Acquisitions (Allocation of Purchase Price) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 81,554 | $ 81,752 |  |  |
TEW Plus LTD [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current assets |  |  |  | $ 4,420 |  |
Other assets |  |  |  | 0 |  |
Property, plant and equipment |  |  |  | 47 |  |
Goodwill |  |  |  | 822 |  |
Other intangibles |  |  |  | 1,074 |  |
Liabilities assumed |  |  |  | (3,597) |  |
Total |  |  |  | $ 2,766 |  |
Inspection Oilfield Services (IOS) [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current assets |  |  |  |  | $ 19,877 |
Other assets |  |  |  |  | 708 |
Property, plant and equipment |  |  |  |  | 51,453 |
Goodwill | [1] |  |  |  | 69,908 |
Other intangibles |  |  |  |  | 50,354 |
Liabilities assumed |  |  |  |  | (23,596) |
Total |  |  |  |  | $ 168,704 |
TEW Holdings, LTD [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current assets |  |  |  |  |  | $ 12,125
Other assets |  |  |  |  |  | 0
Property, plant and equipment |  |  |  |  |  | 2,398
Goodwill |  |  |  |  |  | 8,772
Other intangibles |  |  |  |  |  | 14,048
Liabilities assumed |  |  |  |  |  | (6,465)
Total |  |  |  |  |  | $ 30,878
[1] | As a result of the impact of the downturn within the energy markets, the expectations of a prolonged period before recovery, and the reduction in active U.S. land oil rig count, the Company performed an interim test for impairment of goodwill during the third quarter of 2015 which resulted in the full impairment of goodwill related to the IOS acquisition.

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