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Acquisitions (Identifiable Intangible Assets Acquired) (Details) - USD ($) $ in Thousands | Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015
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TEW Plus LTD [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | $ 1,074 |  |
TEW Plus LTD [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 0 |  |
TEW Plus LTD [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 817 |  |
TEW Plus LTD [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 203 |  |
TEW Plus LTD [Member] | Non-competition agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | $ 54 |  |
Inspection Oilfield Services (IOS) [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | [1],[2] |  | $ 50,354 |
Inspection Oilfield Services (IOS) [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 2,641 |
Inspection Oilfield Services (IOS) [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 41,171 |
Inspection Oilfield Services (IOS) [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 4,364 |
Inspection Oilfield Services (IOS) [Member] | Non-competition agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | $ 2,178 |
TEW Holdings, LTD [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | $ 14,048
TEW Holdings, LTD [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 870
TEW Holdings, LTD [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 10,035
TEW Holdings, LTD [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 2,480
TEW Holdings, LTD [Member] | Non-competition agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | $ 663
[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 that resulted in the full impairment of goodwill related to the IOS acquisition. Additionally, during the second quarter of 2016, the Company performed an interim impairment test due to further deterioration in projections that resulted in impairment of property, plant, and equipment and intangible assets as described in Notes 4 and 5.
[2] | See Note 5 regarding intangible asset impairments.

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