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Acquisitions (Allocation of Purchase Price) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 31, 2014 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 18,932 | $ 81,752 |  |  |  | $ 82,949 |  |  |
TEW Plus LTD [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  | $ 4,420 |  |  |  |  |  |
Other assets |  |  |  | 0 |  |  |  |  |  |
Property, plant and equipment |  |  |  | 47 |  |  |  |  |  |
Goodwill | [1] |  |  | 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 | [1] |  |  |  | 51,453 |  |  |  |  |
Goodwill | [1] |  |  |  | 69,908 |  |  |  |  |
Other intangibles | [1],[2] |  |  |  | 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 | [1] |  |  |  |  | 8,772 |  |  |  |
Other intangibles |  |  |  |  |  | 14,048 |  |  |  |
Liabilities assumed |  |  |  |  |  | (6,465) |  |  |  |
Total |  |  |  |  |  | $ 30,878 |  |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  | $ 15,528 |  |
Other assets |  |  |  |  |  |  |  | 0 |  |
Property, plant and equipment |  |  |  |  |  |  |  | 4,705 |  |
Goodwill | [1] |  |  |  |  |  |  | 22,302 |  |
Other intangibles |  |  |  |  |  |  |  | 33,130 |  |
Liabilities assumed |  |  |  |  |  |  |  | (6,756) |  |
Total |  |  |  |  |  |  |  | $ 68,909 |  |
FWO [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  | $ 131 |
Other assets |  |  |  |  |  |  |  |  | 0 |
Property, plant and equipment |  |  |  |  |  |  |  |  | 0 |
Goodwill | [1] |  |  |  |  |  |  |  | 971 |
Other intangibles |  |  |  |  |  |  |  |  | 419 |
Liabilities assumed |  |  |  |  |  |  |  |  | (418) |
Total |  |  |  |  |  |  |  |  | $ 1,103 |
Carr Concrete [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  | $ 3,180
Other assets |  |  |  |  |  |  |  |  |  | 45
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 7,648
Goodwill | [1] |  |  |  |  |  |  |  |  | 1,936
Other intangibles |  |  |  |  |  |  |  |  |  | 1,348
Liabilities assumed |  |  |  |  |  |  |  |  |  | (1,677)
Total |  |  |  |  |  |  |  |  |  | $ 12,480
[1] | See Note 4 Goodwill and Other Intangible Assets, and Note 7 Property, Plant, and Equipment, with respect to an impairment of property, plant, and equipment, intangible assets, and goodwill related to this acquisition.
[2] | See Note 4 Goodwill and Other Intangible Assets, with respect to an impairment of intangible assets related to this acquisition.

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