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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | May 20, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 428,629 |  | $ 413,640
Sierra Monitor Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Cash included in current assets |  | $ 2,100 |
Current assets (including cash of $2.1 million) |  | 10,500 |
Property, plant and equipment and other noncurrent assets |  | 1,300 |
Goodwill | $ 19,800 | 19,800 |
Total assets acquired |  | 42,600 |
Total liabilities assumed |  | 6,400 |
Net assets acquired |  | 36,200 |
Customer relationships | Sierra Monitor Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 9,600 |
Acquired technology | Sierra Monitor Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 1,400 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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