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Acquisition Activity (Schedule of Acquisition Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Acquisition costs | $ 0 | $ 0 | $ 494
Pacific Instruments, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 431
Stress-Tek, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 63
Accounting and Legal Fees | Pacific Instruments, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 369
Accounting and Legal Fees | Stress-Tek, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 51
Appraisal Fees | Pacific Instruments, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 41
Appraisal Fees | Stress-Tek, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 12
Other | Pacific Instruments, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | 21
Other | Stress-Tek, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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