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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 06, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 48,485 | $ 48,651 | $ 43,052
Cash paid |  | $ 0 | 8,894 | $ 0
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of intangible assets |  | 1 year |  |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of intangible assets |  | 15 years |  |
Customer relationships | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of intangible assets |  | 10 years |  |
Customer relationships | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of intangible assets |  | 15 years |  |
Order backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of intangible assets |  | 1 year |  |
Ecolink Intelligent Technology, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 5,494 |  |  |
Residential Control Systems, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable | 429 |  |  |
Inventories | 1,508 |  |  |
Prepaid expenses and other current assets | 7 |  |  |
Property, plant and equipment | 14 |  |  |
Current liabilities | (408) |  |  |
Net tangible assets acquired | 1,550 |  |  |
Goodwill |  |  | $ 5,500 |
Total purchase price | 12,594 |  |  |
Less: Contingent consideration | (3,700) |  |  |
Cash paid | 8,894 |  |  |
Residential Control Systems, Inc | Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment |  | 1 year |  |
Residential Control Systems, Inc | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life of property, plant and equipment |  | 4 years |  |
Residential Control Systems, Inc | Trade name |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets | 400 |  |  |
Estimated useful life of intangible assets |  | 8 years |  |
Residential Control Systems, Inc | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets | 5,000 |  |  |
Estimated useful life of intangible assets |  | 10 years |  |
Residential Control Systems, Inc | Order backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets | $ 150 |  |  |
Estimated useful life of intangible assets |  | 1 year |  |

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