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Acquisitions (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 02, 2018 | Mar. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition |  |  |  |  |
Goodwill |  |  | $ 71,258 |  | $ 71,258
Payment of contingent acquisition consideration |  |  | $ 1,650 | $ 2,034 |
Innovative Metering Solutions, Inc. |  |  |  |  |
Business Acquisition |  |  |  |  |
Outstanding common stock acquired (as a percent) | 100.00% |  |  |  |
Total purchase consideration | $ 12,000 |  |  |  |
Cash payment | 7,700 |  |  |  |
Working capital adjustment | 300 |  |  |  |
Balance sheet holdback | 700 |  |  |  |
Pre-existing receivables acquired | $ 3,300 |  |  |  |
Receivables |  | $ 3,800 |  |  |
Inventory |  | 800 |  |  |
Machinery and equipment |  | 100 |  |  |
Intangibles |  | 3,600 |  |  |
Goodwill |  | 3,700 |  |  |
Innovative Metering Solutions, Inc. | Customer Relationships |  |  |  |  |
Business Acquisition |  |  |  |  |
Estimated average useful life | 10 years |  |  |  |
D-Flow |  |  |  |  |
Business Acquisition |  |  |  |  |
Outstanding common stock acquired (as a percent) |  |  | 100.00% |  |
Payment of contingent acquisition consideration |  | $ 1,000 |  |  |
Contingent payments |  |  | $ 2,000 |  |

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