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Acquisitions (Allocation of Purchase Price) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 31, 2014 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 162,640 |  |  | $ 82,949 |  |  |
Inspection Oilfield Services (IOS) [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  | $ 19,877 |  |  |  |  |
Other assets |  | 708 |  |  |  |  |
Property, plant and equipment |  | 51,453 |  |  |  |  |
Goodwill |  | 70,676 |  |  |  |  |
Other intangibles |  | 50,354 |  |  |  |  |
Liabilities assumed |  | (24,364) |  |  |  |  |
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 |  |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 15,528 |  |
Other assets |  |  |  |  | 0 |  |
Property, plant and equipment |  |  |  |  | 4,705 |  |
Goodwill |  |  |  |  | 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 |  |  |  |  |  | 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 |  |  |  |  |  |  | 1,936
Other intangibles |  |  |  |  |  |  | 1,348
Liabilities assumed |  |  |  |  |  |  | (1,677)
Total |  |  |  |  |  |  | $ 12,480

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