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Acquisitions (Allocation of Purchase Price) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 23, 2015 | Mar. 13, 2015 | Jan. 13, 2015
--- | --- | --- | --- | --- | --- | ---
Business Acquisition |  |  |  |  |  |
Goodwill | $ 19,785 | $ 18,932 | $ 81,752 |  |  |
TEW Plus LTD |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
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) |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
Current assets |  |  |  |  | $ 19,877 |
Other assets |  |  |  |  | 708 |
Property, plant, and equipment |  |  |  |  | 51,453 |
Goodwill |  |  |  |  | 69,908 |
Other intangibles |  |  |  |  | 50,354 |
Liabilities assumed |  |  |  |  | (23,596) |
Total |  |  |  |  | $ 168,704 |
TEW Holdings, LTD |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |
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

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount, after allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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